JP3641252B2 - Blower - Google Patents

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JP3641252B2
JP3641252B2 JP2002150335A JP2002150335A JP3641252B2 JP 3641252 B2 JP3641252 B2 JP 3641252B2 JP 2002150335 A JP2002150335 A JP 2002150335A JP 2002150335 A JP2002150335 A JP 2002150335A JP 3641252 B2 JP3641252 B2 JP 3641252B2
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JP2002349489A (en
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公伸 山本
融 甲斐
良一 白水
睦 澤西
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松下エコシステムズ株式会社
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Description

【０００１】
【発明の属する技術分野】
本発明は、換気送風機器および空気調和機器に使用される送風機において、特に高静圧時での発生騒音を低減することを可能にし、軸流羽根車の使用範囲を広くすることを可能にした送風機に関する。
【０００２】
【従来の技術】
近年、居住および非居住空間で使用される換気送風機器および空気調和機器に使用される送風機は、静圧をあまり必要としない中低静圧で大風量の換気送風機器および空気調和機器として使用され、これまで種々の設計手法により低騒音の軸流羽根車が設計されてきた。しかし、機器の小型化、機器性能の使用範囲の拡大、さらには用途の幅広い展開がさらに求められ、静圧を必要とする高静圧で大風量の換気送風機器および空気調和機器が必要となってきたが、これまでの送風機では、高静圧時に騒音が急上昇するという問題があった。そこで従来は、静圧を必要とする高静圧の送風機として遠心送風機が用いられてきたが、機器の容積が大きく、小風量であり社会の全てのニーズに応えられなかった。そこで運転時の騒音が低く、小型で性能的に使用範囲が広く、さらに用途の幅広い送風機が必要であり、送風機に用いられる軸流羽根車の設計手法および送風機の展開が求められている。
【０００３】
従来、この種の送風機は、図５７〜図６５に示す構成が一般的であった。以下、その構成について図を参照しながら説明する。図に示すように、送風機本体２０１に遠心羽根車２５５を用い遠心羽根車２５５を備えた渦巻ケーシング２５８の全体を箱体２５７で囲むことにより、流体２５６を軸流方向に送風したり、また軸流羽根車２０２を用いた場合の翼２０６の形状は、回転軸２０４の軸方向に軸流羽根車２０２を投影したときに回転軸２０４に垂直な平面に映し出される投影図において、回転軸２０４を原点Ｏ’とし、軸流羽根車２０２の内周部２１２の投影線を２等分する点を翼内周部投影中心点Ｐｈ’とし、原点Ｏ’と翼内周部投影中心点Ｐｈ’を通る直線を直線Ｘ’、原点Ｏ’を中心とする任意の直径ＤＤ’の円筒面で切断される翼２０６の翼弦投影線ＬＲ’を２等分する翼弦投影中心点ＰＲ’と原点Ｏ’を通る直線と直線Ｘ’のなす角を前進角Ａθ’としたとき、翼２０６の外周部２１１の投影線を２等分する翼外周部投影中心点Ｐｔ’と原点Ｏ’を結ぶ直線と直線Ｘ’のなす角、つまり外周前進角Ａθｔ’は軸流羽根車２０２の回転方向２１０を正方向とし５０゜以下であり、また、回転軸２０４を含む平面で切断される翼２０６の半径方向翼断面２３５は、フラットまたはフラットに近い曲率の大きい略円弧形状であり、また、軸流羽根車２０２の翼２０６の内周部２１２から外周部２１１までの仕事量を一定とする自由渦、翼２０６の内周部２１２から外周部２１１までの取付角Ｃθ’をほぼ一定とする強制渦という流れ分布で設計され、原点Ｏ’を中心とする任意の直径ＤＤ’の円筒面で切断される翼２０６の翼断面２１３における中心線２１４は略円弧形状で翼断面２１３の翼弦長Ｌ’と反りＤ’で反り率Ｑ’は、Ｑ’＝Ｄ’／Ｌ’で与えられ、外周部２１１より内周部２１２の反り率Ｑ’が大きくなる形状であり、また、外周部２１１より内周部２１２の取付角Ｃθ’が大きくなるかあるいは、取付角Ｃθ’が内周部２１２から外周部２１１までほぼ一定であり、また、回転軸２０４の軸方向に軸流羽根車２０２を投影したときに回転軸２０４に垂直な平面に映し出される投影図において、隣り合う翼２０６と翼２０６が重なり合わない構成をしている。
【０００４】
また、ダクト内で軸流羽根車２０２が用いられる際は、下流側に静翼２６０が設置されることが多く、薄肉厚で一定の曲率を有し、この静翼２６０の外周縁２６１の長さは、内周縁２６２の長さよりも長く、すなわち外周側の入口角は内周側の入口角よりも大きい構成が一般的であった。
【０００５】
上記構成において、機器の小型化、機器性能の使用範囲の拡大をするために非常に高い静圧を必要とし、小型で高静圧、大風量を得るためには、軸流羽根車２０２を高回転する必要がある。
【０００６】
これにより翼２０６の１枚当たりの仕事量も増大し、翼２０６の負圧面２１５の境界層の発達により渦の発生も顕著になる。さらに、原点Ｏ’を中心とする任意の直径ＤＤ’の円筒面で切断される翼２０６の任意の翼断面２１３において、翼２０６は、回転方向２１０への前進度合いを示す外周前進角Ａθｔ’が５０゜以下と小さく、内周部２１２から外周部２１１までの任意の翼断面２１３の回転方向の位置の差が小さい。質量をｍ、回転半径をｒ、角速度をωとしたとき遠心力ｆは、ｆ＝ｍ・ｒ・ω2で与えられ、回転数が上昇すると角速度ωだけが大きくなるため、高回転時には低回転時より矢印Ｆ’の方向に大きな遠心力がはたらく。この大きな遠心力により、翼２０６の負圧面２１５の境界層内で内周部２１２から外周部２１１に向かって二次流れ２１７が誘起され、外周部２１１付近では低エネルギー流体が集積する。よって負圧面２１５の外周部２１１付近で乱れが生じ騒音が上昇する。
【０００７】
また、二次流れ２１７により軸流送風機特有の翼２０６の外周部２１１の吸込側２１８付近で逆流２２０の発生を促進し、サージング現象を引き起こす。サージング領域では軸流羽根車２０２の翼２０６の流れ場が不安定になり変動を起こし、また軸流羽根車２０２の回転も不安定になり、騒音が急上昇すると共にファン効率も低下する。
【０００８】
また、回転軸２０４を含む平面で切断される翼２０６の半径方向翼断面２３５は、フラットまたはフラットに近い曲率の大きい略円弧形状であり、軸流羽根車２０２の隣り合う翼２０６と翼２０６との間の流路２３０の流れは、ハブ２０５とケーシング２３１の境界層付近の流れ２３２は、主流２３３より小さく、翼２０６の反りによる遠心力も小さいので、圧力こう配により翼２０６の正圧面２１６から負圧面２１５に向かう流れ２３４を生じ、一対の流路渦２５２を形成する。そして後縁部２０８付近では隣り合う流路２３０の流路渦２５２が接し、随伴渦を生じ、下流で巻き込んで一対の大きな渦になり騒音が増大する。
【０００９】
また、軸流羽根車２０２の翼２０６の半径方向における翼断面２１３の形状は自由渦や強制渦という流れ分布で設計され、外周部２１１より内周部２１２の取付角が大きくなるかあるいは、取付角が内周部２１２から外周部２１１までほぼ一定である。これにより軸流羽根車２０２の作動時には外周部２１１から内周部２１２へ圧力こう配が生じる。また小型で高静圧、大風量を得るために、軸流羽根車２０２を高回転化による大きな遠心力がはたらき、翼２０６の負圧面２１５の境界層内で内周部２１２から外周部２１１に向かって強い二次流れ２１７が誘起される。しかし、二次流れ２１７と軸流羽根車２０２の翼２０６の仕事による圧力こう配とのバランスが合う翼２０６の設計（反り率Ｑ’、取付角Ｃθ’）がなされておらず、流れに乱れが生じ騒音が上昇する。
【００１０】
また、軸流羽根車２０２の翼２０６を軸方向から見たとき、隣り合う翼２０６と翼２０６が重なり合わない構成が一般的である。このような翼２０６と翼２０６との間隔がある軸流羽根車２０２では、高静圧時には軸流羽根車２０２の吸込側２１８と吐出側２１９との圧力差が大きくなり、翼２０６に沿った流れになりにくくなるため、境界層が大きくなり騒音上昇の原因となる。
【００１１】
また、軸流羽根車２０２を通過した流れは、高静圧、高回転時に遠心力の影響で径方向に広がる斜流流れとなるため、特に静翼２６０の外周側の入口部２６３ｔでは、流入するまでの主流流れが枠体２６４の内周面をはね返る２次流れと干渉して一定の流入角を有した流れにならず大きな渦を誘発し、乱れた状態で流入することとなり剥離の影響で流体損失が大きい。また、静翼２６０の内周側の入口部２６３ｈでは、逆流現象が可視化実験等で確認され、主流流れはこの逆流の影響で一定の流入角度を有した流れとならず、乱れた状態で流入することにより、流体損失が大きい。従って、静翼２６０の設置による全圧効率の向上、すなわち消費電力の低減はあまり望めない。
【００１２】
また、高静圧に適している遠心羽根車２５５を用いた送風機本体２０１の場合、流体２５６を軸流方向に送風するための送風機本体２０１の箱体２５７の容積を小さくし、高静圧で大風量を得ようとするのは非常に困難であり、また箱体２５７を用いず渦巻ケーシング２５８をむき出した状態で用いた場合は、流体２５６の経路が吸込と吹き出しにかけて直角に折れ曲がるために、遠心羽根車２５５を用いただけでの用途の展開も行い難かった。
【００１３】
【発明が解決しようとする課題】
このような従来の送風機では、小型で高静圧、大風量を得る際の軸流羽根車の高回転による騒音の上昇が非常に大きく、また高静圧時で軸流羽根車特有のサージング現象の発生による騒音が急上昇するという課題があり、小型で高静圧、大風量を得ることができる軸流羽根車の騒音を低減し、サージング現象の発生を最小限にするとともに、低騒音の軸流羽根車の設計手法を確立することが要求されている。
【００１４】
また、小型で高静圧を得ようとすると消費電力が増加するという課題があり、送風装置の全圧効率を増加させて消費電力を低減することが要求されている。
【００１５】
また、小型で高静圧、大風量を得ることができる低騒音の軸流羽根車を用いた、新たな用途の展開についての課題もあり、多様な用途の展開を示すことが要求されている。
【００１６】
本発明は従来の課題を解決するものであり、小型で高静圧、大風量を得ることができる軸流羽根車の騒音を低減することができ、軸流送風機特有のサージング現象の発生を最小限にし、使用範囲を広くすることができるとともに、その設計手法を確立した軸流羽根車を有する送風機を提供することを目的とする。
【００１７】
【課題を解決するための手段】
この目的を達成するための第１の手段を以下に示す。
【００１８】
本発明の送風機はこの目的を達成するために第１の手段は、軸流羽根車の回転軸を含む平面で切断される任意の翼断面において、最も吸込側に位置する点を頂点とし、任意の前記翼断面における複数の頂点を結ぶ曲線が、前記翼の前縁部またはその前縁部と外周部との交点から、後縁部またはその後縁部と内周部との交点まで通る前記軸流羽根車を有し、また前記軸流羽根車の翼の内周部と後縁部との交点を点Ｂｈとして、その点Ｂｈを通り回転軸を直交する面を基準面Ｊとし、前記後縁部と外周部との交点を点Ｂｋとするとき、前記頂点と前記点Ｂｋが前記基準面Ｊよりすべて前記吸込側に位置する前記軸流羽根車を有する送風機としたものである。
【００１９】
また、前記目的を達成するために第２の手段は、前記第１の手段に、軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、その翼断面における中心線は略円弧形状とし、前記翼断面の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部の翼断面における外周部反り率Ｑｔが、前記外周部より内周側の任意の前記反り率Ｑより大きな値をとる前記軸流羽根車を有する送風機としたものである。
【００２０】
また、前記目的を達成するために第３の手段は、前記第１の手段に、軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、その翼断面における中心線は略円弧形状とし、翼断面の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部の翼断面における外周部反り率Ｑｔが、前記外周部より内周側の任意の前記反り率Ｑより大きな値をとり、前記外周部反り率Ｑｔと前記翼の内周部の翼断面における内周部反り率Ｑｈとの差が０．００１以上０．０２０以下になる前記軸流羽根車を有する送風機としたものである。
【００２１】
また、前記目的を達成するために第４の手段は、前記第１の手段に、軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、翼弦と、回転軸と垂直で翼の前縁部を通る直線である翼列線とのなす角を取付角Ｃθとし、外周部の翼断面における外周部取付角Ｃθｔが、前記外周部より内周側の任意の前記取付角Ｃθより大きな値をとる前記軸流羽根車を有する送風機としたものである。
【００２２】
また、前記目的を達成するために第５の手段は、前記第１の手段に、軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、翼弦と、回転軸と垂直で翼の前縁部を通る直線である翼列線とのなす角を取付角Ｃθとし、外周部の翼断面における外周部取付角Ｃθｔが、前記外周部より内周側の任意の前記取付角Ｃθより大きな値をとり、前記外周部取付角Ｃθｔと前記翼の内周部の翼断面における内周部取付角Ｃθｈとの差が０．１゜以上６゜以下になる前記軸流羽根車を有する送風機としたものである。
【００２３】
また、前記目的を達成するために第６の手段は、前記第１の手段に、軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、その翼断面における中心線は略円弧形状とし、前記翼断面の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部の翼断面における外周部反り率Ｑｔが、前記外周部より内周側の任意の前記反り率Ｑより大きな値をとり、かつ、前記翼断面における翼弦と、回転軸と垂直で翼の前縁部を通る直線である翼列線とのなす角を取付角Ｃθとし、前記外周部の翼断面における外周部取付角Ｃθｔが、前記外周部より内周側の任意の前記取付角Ｃθより大きな値をとる前記軸流羽根車を有する送風機としたものである。
【００２４】
また、前記目的を達成するために第７の手段は、前記第１の手段に、軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、その翼断面における中心線は略円弧形状とし、前記翼断面の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部の翼断面における外周部反り率Ｑｔが、前記外周部より内周側の任意の前記反り率Ｑより大きな値をとり、前記外周部反り率Ｑｔと前記翼の前記内周部の翼断面における内周部反り率Ｑｈとの差が０．００１以上０．０２０以下になり、かつ、前記翼断面における翼弦と、前記回転軸と垂直で前記翼の前縁部を通る直線である翼列線とのなす角を取付角Ｃθとし、前記外周部の翼断面における外周部取付角Ｃθｔが、前記外周部より内周側の任意の前記取付角Ｃθより大きな値をとり、前記外周部取付角Ｃθｔと前記翼の前記内周部の翼断面における内周部取付角Ｃθｈとの差が０．１゜以上６゜以下になる前記軸流羽根車を有する送風機としたものである。
【００２５】
また、前記目的を達成するために第８の手段は、前記第１、２、３、４、５、６または７の手段に、軸流羽根車の任意の直径ＤＤの翼断面における翼弦長Ｌと、回転軸と垂直で翼の前縁部を通る直線である翼列線上で、前記翼の前記前縁部と前記翼と隣り合う前記翼の前記前縁部との距離をピッチＴとしたとき弦節比Ｓは、Ｓ＝Ｌ／Ｔで与え、弦節比Ｓは１．１以上１．９以下になる前記軸流羽根車を有する送風機としたものである。
【００２６】
【発明の実施の形態】
本発明は上記した第１の手段の構成により、軸流羽根車の翼の半径方向の形状が、流体の吸込側に傾斜のある凸形状であり、これらの要因の水準を最適化し、これに基づき軸流羽根車を設計しているために小型で高静圧、大風量を得ることができる軸流羽根車の騒音を低減することができ、軸流送風機特有のサージング現象の発生を最小限にし、使用範囲を広くすることができる。
【００２７】
また、第２、３、４、５、６、７または第８の手段の構成により、軸流羽根車の翼の半径方向の形状が、流体の吸込側に傾斜のある凸形状であり、翼の周方向の形状が、翼の内周部より外周部の反り率が大きくなる形状で、翼の内周部より外周部の取付角が大きくなる形状であり、また隣合う翼と翼が重なり合い、これらの要因の水準を最適化し、これに基づき軸流羽根車を設計しているために小型で高静圧、大風量を得ることができる軸流羽根車の騒音を低減することができ、軸流送風機特有のサージング現象の発生を最小限にし、使用範囲を広くすることができる。
【００２８】
【実施例】
（参考例１）
以下、本発明の参考例１について図１〜図７および図２２を参照しながら説明する。
【００２９】
図に示すように、送風機本体１の電動機３に係止される軸流羽根車２の回転軸４の軸方向に軸流羽根車２を投影したときに回転軸４に垂直な平面に映し出される投影図において、回転軸４を原点Ｏ、軸流羽根車２の羽根径Ｄｔの０．４０８２倍の直径を仮想ハブ径ＫＤｈとし、その仮想ハブ径ＫＤｈを軸流羽根車２の翼６の前縁部７と後縁部８とで区切られてできる仮想ハブ円弧ＫＡｈを２等分する点を仮想ハブ円弧中心点Ｋｈとして、原点Ｏと仮想ハブ円弧中心点Ｋｈを通る直線を直線Ｘ、原点Ｏを中心とする任意の直径ＤＤの円筒面で切断される翼６の翼弦投影線ＬＲを２等分する翼弦投影中心点ＰＲと原点Ｏを通る直線と直線Ｘのなす角を前進角Ａθとしたとき、翼６の翼内周部投影線９を２等分する翼外周部投影中心点Ｐｔと原点Ｏを結ぶ直線と直線Ｘのなす角、つまり外周前進角Ａθｔは軸流羽根車２の回転方向１０を正方向とし５５゜以上１８０゜以下であり、外周部１１より内周側の任意の前進角Ａθは外周前進角Ａθｔより小さな値をとり、かつ、羽根径Ｄｔとする軸流羽根車２のハブ５のハブ径Ｄｈは、０＜Ｄｈ≦Ｄｔ・（１−３２．５４９／Ａθｔ）の範囲であり、かつ、軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、その翼断面１３における中心線１４は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部１１の翼断面１３における外周部反り率Ｑｔが、外周部１１より内周側の任意の反り率Ｑより大きな値をとる軸流羽根車２を有する構成にされている。
【００３０】
上記構成により、機器の小型化、機器性能の使用範囲の拡大をするために非常に高い静圧を必要とし、小型で高静圧、大風量を得るためには送風機本体１のケーシング３１に係止される電動機３により軸流羽根車２を高回転する必要がある。質量をｍ、回転半径をｒ、角速度をωとしたとき遠心力ｆは、ｆ＝ｍ・ｒ・ω2で与えられる。回転数が上昇すると角速度ωだけが大きくなるため、高回転時には低回転時より矢印Ｆの方向に大きな遠心力がはたらく。この大きな遠心力により、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かって二次流れ１７が誘起される。しかし軸流羽根車２の翼６は、回転方向１０に大きく前進した形状であるため二次流れ１７は後縁部８より放出することができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。
【００３１】
また、翼６の前縁部７は回転方向１０に大きく前進した形状であるために、前縁部７の外周部１１は内周側の二次流れ１７の影響を受けることはないので、外周部１１の吸込側１８付近での逆流２０の発生も起こりにくい。よって、軸流送風機特有の回転が不安定になり騒音が急上昇しファン効率が低下するサージング現象を発生しにくく、高静圧側へ移動できるために軸流羽根車２の使用領域を増やすことができる。
【００３２】
また、ハブ径Ｄｈと軸流羽根車２の羽根径Ｄｔは、０＜Ｄｈ≦Ｄｔ・（１−３２．５４９／Ａθｔ）の範囲で特に騒音低減に効果があり、送風機本体１の構造、大きさの変化に対応した低騒音の軸流羽根車２の設計が可能となる。
【００３３】
また、翼６の翼断面１３における中心線１４は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与えたとき、外周部反り率Ｑｔは外周部１１より内周側の任意の反り率Ｑより大きな値になっているため、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。
【００３４】
ここで、比騒音レベルＫｓ（ｄＢ（Ａ））を、Ｋｓ＝ＳＰＬ−１０・Ｌｏｇ（（Ｐｓ＋Ｐｖ）2・Ｑ）のように定義する。
【００３５】
ＳＰＬ：騒音レベルＱ：風量Ｐｓ：静圧Ｐｖ：動圧図２２に示すように、軸流羽根車２の回転方向１０を正方向とした外周前進角Ａθｔは、５５゜以上１８０゜以下で比騒音レベルＫｓが小さくなっていることがわかる。また外周前進角Ａθｔは１０５゜付近で最小の比騒音レベルＫｓになる。
【００３６】
このように本発明の参考例１の送風機によれば、軸流羽根車２のハブ径Ｄｈと軸流羽根車２の羽根径Ｄｔは、０＜Ｄｈ≦Ｄｔ・（１−３２．５４９／Ａθｔ）の範囲で、翼６の外周前進角Ａθｔを５５゜以上１８０゜以下、外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値の範囲で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することと、軸流送風機特有の回転が不安定になり騒音が急上昇しファン効率が低下するサージング現象を発生しにくく、高静圧側へ移動できるために軸流羽根車２の使用領域を増やすことができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【００３７】
なお、参考例１では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【００３８】
また、軸流羽根車２の外周部１１に略円筒状のリング２２を設けることにより、軸流羽根車２が回転した際に起こる翼６の変形あるいは破壊を防ぐことを行っても同等の効果を得ることができ、翼６の変形あるいは破壊を防ぐ強度向上のための軸流羽根車２および翼６の形状はこの限りではない。
【００３９】
（実施例１）
つぎに本発明の実施例１について図１〜図７および図２３を参照しながら説明する。なお、参考例１と同一箇所には同一番号を付けて詳細な説明は省略する。
【００４０】
図に示すように、参考例１の構成に軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、その翼断面１３における中心線は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部１１の翼断面１３における外周部反り率Ｑｔが、外周部１１より内周側の任意の反り率Ｑより大きな値をとり、外周部反り率Ｑｔと翼６の内周部１２の翼断面１３における内周部反り率Ｑｈとの差が０．００１以上０．０２０以下になる軸流羽根車２を有する構成にされている。
【００４１】
上記構成により、軸流羽根車２の翼６の仕事量を決定する重要な要因の１つである反り率Ｑの半径方向分布を、ここでは外周部反り率Ｑｔと内周部反り率Ｑｂとの差で考え、反り率差の最適化を、外周前進角Ａθｔは１０５゜の最適の水準を用いて、外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値で行なった。この翼６の形状により、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。そこでさらに、外周部１１から内周部１２へ圧力こう配と内周部１２から外周部１１に向かう二次流れ１７のバランスを合わせることで反り率差の最適化ができ、軸流羽根車２の騒音の低減ができる。図２３に示すように反り率差は、０．００１以上０．０２０以下で比騒音レベルＫｓが小さくなっていることがわかる。また反り率差は、０．００８付近で最小の比騒音レベルＫｓになる。
【００４２】
このように本発明の実施例１の送風機によれば、軸流羽根車２の外周部反り率Ｑｔと翼６の内周部１２の翼断面１３における内周部反り率Ｑｈとの差が０．００１以上０．０２０以下の範囲で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【００４３】
なお、実施例１では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果が得ることができるので、羽根車は斜流羽根車２１でも良い。
【００４４】
（実施例２）
つぎに本発明の実施例２について図１〜図７および図２２を参照しながら説明する。なお、参考例１と同一箇所には同一番号を付けて詳細な説明は省略する。
【００４５】
図に示すように、送風機本体１の電動機３に係止される軸流羽根車２の回転軸４の軸方向に軸流羽根車２を投影したときに回転軸４に垂直な平面に映し出される投影図において、回転軸４を原点Ｏ、軸流羽根車２の羽根径Ｄｔの０．４０８２倍の直径を仮想ハブ径ＫＤｈとし、その仮想ハブ径ＫＤｈを軸流羽根車２の翼６の前縁部７と後縁部８とで区切られできる仮想ハブ円弧ＫＡｈを２等分する点を仮想ハブ円弧中心点Ｋｈとして、原点Ｏと仮想ハブ円弧中心点Ｋｈを通る直線を直線Ｘ、原点Ｏを中心とする任意の直径ＤＤの円筒面で切断される翼６の翼弦投影線ＬＲを２等分する翼弦投影中心点ＰＲと原点Ｏを通る直線と前記直線Ｘのなす角を前進角Ａθとしたとき、翼６の翼外周部投影線９を２等分する翼外周部投影中心点Ｐｔと原点Ｏを結ぶ直線と直線Ｘのなす角、つまり外周前進角Ａθｔは軸流羽根車２の回転方向１０を正方向とし５５゜以上１８０゜以下であり、外周部１１より内周側の任意の前進角Ａθは外周前進角Ａθｔより小さな値をとり、かつ、羽根径Ｄｔとする軸流羽根車２のハブ５のハブ径Ｄｈは、０＜Ｄｈ≦Ｄｔ（１−３２．５４９／Ａθｔ）の範囲であり、かつ、軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、翼弦２３と、回転軸４と垂直で翼６の前縁部７を通る直線である翼列線２４とのなす角を取付角Ｃθとし、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値をとる軸流羽根車２を有する構成にされている。
【００４６】
上記構成により、機器の小型化、機器性能の使用範囲の拡大をするために非常に高い静圧を必要とし、小型で高静圧、大風量を得るためには送風機本体１の電動機３により軸流羽根車２を高回転する必要がある。質量をｍ、回転半径をｒ、角速度をωとしたとき遠心力ｆは、ｆ＝ｍ・ｒ・ω2で与えられる。回転数が上昇すると角速度ωだけが大きくなるため、高回転時には低回転時より矢印Ｆの方向に大きな遠心力がはたらく。この大きな遠心力により、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かって二次流れ１７が誘起される。しかし軸流羽根車２の翼６は、回転方向１０に大きく前進した形状であるため二次流れ１７は後縁部８より放出することができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。
【００４７】
また、翼６の前縁部７は回転方向１０に大きく前進した形状であるために、前縁部７の外周部１１は内周側の二次流れ１７の影響を受けることはないので、外周部１１の吸込側１８付近での逆流２０の発生も起こりにくい。よって、軸流送風機特有の回転が不安定になり騒音が急上昇しファン効率が低下するサージング現象を発生しにくく、高静圧側へ移動できるために軸流羽根車２の使用領域を増やすことができる。
【００４８】
また、ハブ径Ｄｈと軸流羽根車２の羽根径Ｄｔは、０＜Ｄｈ≦Ｄｔ・（１−３２．５４９／Ａθｔ）の範囲で特に騒音低減に効果があり、送風機本体１の構造、大きさの変化に対応した低騒音の軸流羽根車２の設計が可能となる。
【００４９】
また、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値になっているため、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。
【００５０】
ここで、比騒音レベルＫｓ（ｄＢ（Ａ））を、Ｋｓ＝ＳＰＬ−１０・Ｌｏｇ（（Ｐｓ＋Ｐｖ）2・Ｑ）のように定義する。
【００５１】
ＳＰＬ：騒音レベルＱ：風量Ｐｓ：静圧Ｐｖ：動圧図に示すように、軸流羽根車２の回転方向１０を正方向とした外周前進角Ａθｔは、５５゜以上１８０゜以下で比騒音レベルＫｓが小さくなっていることがわかる。また外周前進角Ａθｔは１０５゜付近で最小の比騒音レベルＫｓになる。
【００５２】
このように本発明の実施例２の送風機によれば、軸流羽根車２のハブ径Ｄｈと軸流羽根車２の羽根径Ｄｔは、０＜Ｄｈ≦Ｄｔ・（１−３２．５４９／Ａθｔ）の範囲で、翼６の外周前進角Ａθｔを５５゜以上１８０゜以下、外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することと、軸流送風機特有の回転が不安定になり騒音が急上昇しファン効率が低下するサージング現象を発生しにくく、高静圧側へ移動できるために軸流羽根車２の使用領域を増やすことができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【００５３】
なお、実施例２では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【００５４】
また、軸流羽根車２の外周部１１に略円筒状のリング２２を設けることにより、軸流羽根車２が回転した際に起こる翼６の変形あるいは破壊を防ぐことを行っても同等の効果を得ることができ、翼６の変形あるいは破壊を防ぐ強度向上のための軸流羽根車２および翼６の形状はこの限りではない。
【００５５】
（実施例３）
つぎに本発明の実施例３について図１〜図７および図２４を参照しながら説明する。なお、実施例２と同一箇所には同一番号を付けて詳細な説明は省略する。
【００５６】
図に示すように、実施例３の構成に軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、翼弦２３と、回転軸４と垂直で翼６の前縁部７を通る直線である翼列線２４とのなす角を取付角Ｃθとし、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値をとり、外周部取付角Ｃθｔと翼６の内周部１２の翼断面１３における内周部取付角Ｃθｈとの差が０．１゜以上６゜以下になる軸流羽根車２を有する構成にされている。
【００５７】
上記構成により、軸流羽根車２の翼６の仕事量を決定する重要な要因の１つである取付角Ｃθの半径方向分布を、ここでは外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差で考え、取付角差の最適化を、外周前進角Ａθｔは１０５゜の最適の水準を用いて外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値で行なった。この翼６の形状により、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。そこでさらに、外周部１１から内周部１２へ圧力こう配と内周部１２から外周部１１に向かう二次流れ１７のバランスを合わせることで取付角差の最適化ができ、軸流羽根車２の騒音の低減ができる。図２４に示すように取付角差は、０．１゜以上６゜以下で比騒音レベルＫｓが小さくなっていることがわかる。また取付角差は、２゜付近で最小の比騒音レベルＫｓになる。
【００５８】
このように本発明の実施例３の送風機によれば、軸流羽根車２の外周部取付角Ｃθｔと翼６の内周部１２の翼断面１３における内周部取付角Ｃθｈとの差が０．１゜以上６゜以下の範囲で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【００５９】
なお、実施例３では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【００６０】
（実施例４）
つぎに本発明の実施例４について図１〜図７を参照しながら説明する。なお、参考例１および実施例２と同一箇所には同一番号を付けて詳細な説明は省略する。
【００６１】
図に示すように、参考例１および実施例２の構成に、軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、その翼断面１３における中心線１４は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部１１の翼断面１３における外周部反り率Ｑｔが、外周部１１より内周側の任意の反り率Ｑより大きな値をとり、かつ、翼断面１３における翼弦２３と、回転軸４と垂直で翼６の前縁部７を通る直線である翼列線２４とのなす角を取付角Ｃθとし、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値をとる軸流羽根車２を有する構成にされている。
【００６２】
上記構成により、翼６の翼断面１３における中心線１４は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与えたとき、外周部反り率Ｑｔは外周部１１より内周側１２の任意の反り率Ｑより大きな値で、また、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値になっているため、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。
【００６３】
このように本発明の実施例４の送風機によれば、外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値、外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することと、軸流送風機特有の回転が不安定になり騒音が急上昇しファン効率が低下するサージング現象を発生しにくく、高静圧側へ移動できるために軸流羽根車２の使用領域を増やすことができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【００６４】
なお、実施例４では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【００６５】
（実施例５）
つぎに本発明の実施例５について図１〜図７を参照しながら説明する。なお、実施例１および実施例３と同一箇所には同一番号を付けて詳細な説明は省略する。
【００６６】
図に示すように、実施例１および実施例３の構成に、外周部反り率Ｑｔと内周部反り率Ｑｂとの差が０．００１以上０．０２０以下になり、外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差が０．１゜以上６゜以下になる軸流羽根車２を有する構成にされている。
【００６７】
上記構成により、軸流羽根車２の翼６の仕事量を決定する重要な要因である反り率Ｑと取付角Ｃθの半径方向分布を、ここでは外周部反り率Ｑｔと内周部反り率Ｑｂとの差と、外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差で考え、最適化を外周前進角Ａθｔは１０５゜の最適の水準を用いて、外周部反り率Ｑｔが外周部１１より内周側１２の任意の反り率Ｑより大きな値、外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で行なった。この翼６の形状により、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。そこでさらに、外周部１１から内周部１２へ圧力こう配と内周部１２から外周部１１に向かう二次流れ１７のバランスを合わせることで反り率差、取付角差の最適化ができ、軸流羽根車２の騒音の低減ができる。図に示すように反り率差は、０．００１以上０．０２０以下で比騒音レベルＫｓが小さくなっていることがわかる。また反り率差は、０．００８付近で最小の比騒音レベルＫｓになる。また、図に示すように取付角差は、０．１゜以上６゜以下で比騒音レベルＫｓが小さくなっていることがわかる。また取付角差は、２゜付近で最小の比騒音レベルＫｓになる。
【００６８】
このように本発明の実施例５の送風機によれば、軸流羽根車２の外周部反り率Ｑｔと内周部反り率Ｑｂとの差を０．００１以上０．０２０以下で外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値、軸流羽根車２の外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差を０．１゜以上６゜以下で外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【００６９】
なお、実施例５では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【００７０】
（実施例６）
つぎに本発明の実施例６について図１〜図８および図２５を参照しながら説明する。なお、参考例１、実施例１〜実施例５と同一箇所には同一番号を付けて詳細な説明は省略する。
【００７１】
図に示すように、参考例１、第１、２、３、４および実施例５の構成に、軸流羽根車２の任意の直径ＤＤの翼断面１３における翼弦長Ｌと、回転軸４と垂直で翼６の前縁部７を通る直線である翼列線２４上で、翼６の前縁部７と翼６と隣り合う翼６の前縁部７との距離をピッチＴとしたとき、弦節比Ｓは、Ｓ＝Ｌ／Ｔで与え、弦節比Ｓは１．１以上１．９以下になる軸流羽根車２を有する構成にされている。
【００７２】
上記構成により、翼弦長Ｌが変化しない場合、翼６の間隔つまりピッチＴを小さくする、つまり翼６の枚数を増やすことで高静圧時でも流れ２５を翼６に沿いやすくし、境界層の厚みを小さくすることで騒音の低減を図ることができる。しかし、ピッチＴを極端に小さくする、つまり翼６の枚数を増やしすぎると各々の翼６より発生する騒音の音源の数が翼６の枚数と等しいことから、軸流羽根車２全体での騒音が上昇する原因となる。そこでＳ＝Ｌ／Ｔで与えられる弦節比Ｓの最適化を、外周前進角Ａθｔは１０５゜、外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値で外周部反り率Ｑｔと内周部反り率Ｑｂとの差を０．００８、外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差を２゜の最適の水準を用いて行なった。図２５に示すように弦節比Ｓは、１．１以上１．９以下で比騒音レベルＫｓが小さくなっていることがわかる。また弦節比Ｓは、１．５付近で最小の比騒音レベルＫｓになる。
【００７３】
このように本発明の実施例６の送風機によれば、軸流羽根車２の翼６の弦節比Ｓは、１．１以上１．９以下の範囲で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【００７４】
なお、実施例５では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【００７５】
（参考例２）
つぎに本発明の参考例２について図１〜図１１を参照しながら説明する。なお、実施例５〜実施例６と同一箇所には同一番号を付けて詳細な説明は省略する。
【００７６】
図に示すように、軸流羽根車２の回転軸４を含む平面で切断される任意の翼断面１３において、最も吸込側１８に位置する点を頂点２６とし、任意の翼断面１３における複数の頂点２６を結ぶ曲線２７が、翼６の前縁部７またはその前縁部７と外周部１１との交点から、後縁部８またはその後縁部８と内周部１２との交点まで通る軸流羽根車２を有する構成にされている。
【００７７】
上記構成により、隣り合う翼６と翼６との間の流路３０の流れは、ハブ５とケーシング３１の境界層付近の流れ３２は、主流３３より小さく、翼６の反りＤによる遠心力も小さいので、圧力こう配により翼６の正圧面１６から負圧面１５に向かう流れ３４を生じる。しかし、軸流羽根車２の翼６の前縁部７と外周部１１との交点、後縁部８と内周部１２との交点を含まない、回転軸４を含む平面で切断される任意の翼断面１３において、最も吸込側１８に位置する頂点２６が、翼断面１３の外周縁２８または内周縁２９に存在しない負圧面１５側に凸形状であるために流れ３４は、翼断面１３の外周縁２８または内周縁２９で止められ、一対の流路渦の形成を防ぐことができる。また、流路渦が形成されにくいため随伴渦の形成を防ぐことができ、騒音の低減が可能となる。
【００７８】
このように本発明の参考例２の送風機によれば、軸流羽根車２の回転軸４を含む平面で切断される任意の翼断面１３において、最も吸込側１８に位置する点を頂点２６とし、任意の翼断面１３における複数の頂点２６を結ぶ曲線２７が、翼６の前縁部７またはその前縁部７と外周部１１との交点から、後縁部８またはその後縁部８と内周部１２との交点まで通る形状にすることにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【００７９】
なお、参考例２では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、同等の効果を得ることができる。
【００８０】
また、軸流羽根車２の外周部１１に略円筒状のリング２２を設けることにより、軸流羽根車２が回転した際に起こる翼６の変形あるいは破壊を防ぐことを行っても同等の効果を得ることができ、翼６の変形あるいは破壊を防ぐ強度向上のための軸流羽根車２および翼６の形状はこの限りではない。
【００８１】
（実施例７）
つぎに本発明の実施例７について図１〜図１２を参照しながら説明する。なお、参考例１、２、実施例１〜実施例６と同一箇所には同一番号を付けて詳細な説明は省略する。
【００８２】
図に示すように参考例２の構成に、軸流羽根車２の回転軸４を含む平面で切断される任意の翼断面１３において、最も吸込側１８に位置する点を頂点２６とし、また軸流羽根車２の翼６の内周部１２と後縁部８との交点を点Ｂｈとして、その点Ｂｈを通り回転軸４を直交する面を基準面Ｊとし、後縁部８と外周部１１との交点を点Ｂｋとするとき、頂点２６と点Ｂｋが基準面Ｊよりすべて吸込側１８に位置する軸流羽根車２を有する構成にされている。
【００８３】
上記構成により、軸流羽根車２が回転し矢印Ｆの方向に遠心力がはたらき、翼６を吸込側１８に前傾させることで遠心力の負圧面１５の法線成分Ｆｖがはたらくことで、翼６の負圧面１５における境界層の厚みを抑えることができ、騒音を低減することができる。
【００８４】
このように本発明の実施例７の送風機によれば、翼６を吸込側１８に前傾させる形状にすることにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【００８５】
なお、実施例７では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、同等の効果を得ることができる。
【００８６】
（参考例３）
つぎに本発明の参考例３について図１〜図１２を参照しながら説明する。なお、参考例２および実施例７と同一箇所には同一番号を付けて詳細な説明は省略する。
【００８７】
図に示すように参考例２および実施例７９の構成に、軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、その翼断面１３における中心線１４は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部１１の翼断面１３における外周部反り率Ｑｔが、外周部１１より内周側の任意の反り率Ｑより大きな値をとる軸流羽根車２を有する構成にされている。
【００８８】
上記構成により、図に示すように、翼６の翼断面１３における中心線１４は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与えたとき、外周部反り率Ｑｔが、外周部１１より内周側の任意の反り率Ｑより大きな値になっているため、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。
【００８９】
このように本発明の参考例３の送風機によれば、外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することと、軸流送風機特有の回転が不安定になり騒音が急上昇しファン効率が低下するサージング現象を発生しにくく、高静圧側へ移動できるために軸流羽根車２の使用領域を増やすことができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【００９０】
なお、参考例３では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、同等の効果を得ることができる。
【００９１】
（実施例８）
つぎに本発明の実施例８について図１〜図１２および図２６を参照しながら説明する。なお、参考例２、３、実施例７と同一箇所には同一番号を付けて詳細な説明は省略する。
【００９２】
図に示すように参考例２および実施例７の構成に、軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、その翼断面１３における中心線は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部１１の翼断面１３における外周部反り率Ｑｔが、外周部１１より内周側の任意の反り率Ｑより大きな値をとり、外周部反り率Ｑｔと翼６の内周部１２の翼断面１３における内周部反り率Ｑｈとの差が０．００１以上０．０２０以下になる軸流羽根車２を有する構成にされている。
【００９３】
上記構成により、軸流羽根車２の翼６の仕事量を決定する重要な要因の１つである反り率Ｑの半径方向分布を、ここでは外周部反り率Ｑｔと内周部反り率Ｑｂとの差で考え、反り率差の最適化を外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値で行なった。この翼６の形状により、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。そこでさらに、外周部１１から内周部１２へ圧力こう配と内周部１２から外周部１１に向かう二次流れ１７のバランスを合わせることで反り率差の最適化ができ、軸流羽根車２の騒音の低減ができる。図２６に示すように反り率差は、０．００１以上０．０２０以下で比騒音レベルＫｓが小さくなっていることがわかる。また反り率差は、０．００８付近で最小の比騒音レベルＫｓになる。
【００９４】
このように本発明の実施例８の送風機によれば、軸流羽根車２の外周部反り率Ｑｔと翼６の内周部１２の翼断面１３における内周部反り率Ｑｈとの差が０．００１以上０．０２０以下の範囲で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【００９５】
なお、実施例８では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、同等の効果を得ることができる。
【００９６】
（参考例４）
つぎに本発明の参考例４について図１〜図１２を参照しながら説明する。なお、参考例２および実施例７と同一箇所には同一番号を付けて詳細な説明は省略する。
【００９７】
図に示すように参考例２および実施例７の構成に、軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、翼弦２３と、回転軸４と垂直で翼６の前縁部７を通る直線である翼列線２４とのなす角を取付角Ｃθとし、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値をとる軸流羽根車２を有する構成にされている。
【００９８】
上記構成により、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１
より内周側の任意の取付角Ｃθより大きな値になっているため、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。
【００９９】
このように本発明の参考例４の送風機によれば、外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【０１００】
なお、参考例４では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、同等の効果を得ることができる。
【０１０１】
（参考例５）
つぎに本発明の参考例５について図１〜図１２および図２７を参照しながら説明する。なお、参考例２、実施例７および参考例４と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１０２】
図に示すように参考例２および実施例７の構成に、軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、翼弦２３と、回転軸４と垂直で翼６の前縁部７を通る直線である翼列線２４とのなす角を取付角Ｃθとし、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値をとり、外周部取付角Ｃθｔと翼６の内周部１２の翼断面１３における内周部取付角Ｃθｈとの差が０．１゜以上６゜以下になる軸流羽根車２を有する構成にされている。
【０１０３】
上記構成により、軸流羽根車２の翼６の仕事量を決定する重要な要因の１つである取付角Ｃθの半径方向分布を、ここでは外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差で考え、取付角差の最適化を、外周前進角Ａθｔは１０５゜の最適の水準を用いて外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値で行なった。この翼６の形状により、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。そこでさらに、外周部１１から内周部１２へ圧力こう配と内周部１２から外周部１１に向かう二次流れ１７のバランスを合わせることで取付角差の最適化ができ、軸流羽根車２の騒音の低減ができる。図２７に示すように取付角差は、０．１゜以上６゜以下で比騒音レベルＫｓが小さくなっていることがわかる。また取付角差は、２゜付近で最小の比騒音レベルＫｓになる。
【０１０４】
このように本発明の参考例５の送風機によれば、軸流羽根車２の外周部取付角Ｃθｔと翼６の内周部１２の翼断面１３における内周部取付角Ｃθｈとの差が０．１゜以上６゜以下の範囲で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【０１０５】
なお、参考例５では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、同等の効果が得ることができる。
【０１０６】
（参考例６）
つぎに本発明の参考例６について図１〜図１２を参照しながら説明する。なお、参考例２および実施例７と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１０７】
図に示すように、参考例２および実施例７の構成に、軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面で翼６を切断して、断面を２次元に展開してできる翼断面１３で、その翼断面１３における中心線１４は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部１１の翼断面１３における外周部反り率Ｑｔが、外周部１１より内周側の任意の反り率Ｑより大きな値をとり、かつ、翼断面１３における翼弦２３と、回転軸４と垂直で翼６の前縁部７を通る直線である翼列線２４とのなす角を取付角Ｃθとし、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値をとる軸流羽根車２を有する構成にされている。
【０１０８】
上記構成により、翼６の翼断面１３における中心線１４は略円弧形状とし、翼断面１３の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与えたとき、外周部反り率Ｑｔは外周部１１より内周側の任意の反り率Ｑより大きな値で、また、外周部１１の翼断面１３における外周部取付角Ｃθｔが、外周部１１より内周側の任意の取付角Ｃθより大きな値になっているため、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。
【０１０９】
このように本発明の参考例６の送風機によれば、外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値、外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することと、軸流送風機特有の回転が不安定になり騒音が急上昇しファン効率が低下するサージング現象を発生しにくく、高静圧側へ移動できるために軸流羽根車２の使用領域を増やすことができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【０１１０】
なお、参考例６では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、同等の効果を得ることができる。
【０１１１】
（参考例７）
つぎに本発明の参考例７について図１〜図１２、図２６および図２７を参照しながら説明する。なお、参考例２および実施例７および参考例６と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１１２】
図に示すように、参考例２および実施例７の構成に、外周部反り率Ｑｔと内周部反り率Ｑｂとの差が０．００１以上０．０２０以下になり、外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差が０．１゜以上６゜以下になる軸流羽根車２を有する構成にされている。
【０１１３】
上記構成により、軸流羽根車２の翼６の仕事量を決定する重要な要因である反り率Ｑと取付角Ｃθの半径方向分布を、ここでは外周部反り率Ｑｔと内周部反り率Ｑｂとの差と、外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差で考え、最適化を外周前進角Ａθｔは１０５゜の最適の水準を用いて、外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値、外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で行なった。この翼６の形状により、翼６の内周部１２より外周部１１の仕事量が大きく、外周部１１から内周部１２へ圧力こう配が生じる。これにより、翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かう遠心力による二次流れ１７を止めることができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。そこでさらに、外周部１１から内周部１２へ圧力こう配と内周部１１から外周部１２に向かう二次流れ１７のバランスを合わせることで反り率差、取付角差の最適化ができ、軸流羽根車２の騒音の低減ができる。図２６に示すように反り率差は、０．００１以上０．０２０以下で比騒音レベルＫｓが小さくなっていることがわかる。また反り率差は、０．００８付近で最小の比騒音レベルＫｓになる。また、図２７に示すように取付角差は、０．１゜以上６゜以下で比騒音レベルＫｓが小さくなっていることがわかる。また取付角差は、２゜付近で最小の比騒音レベルＫｓになる。
【０１１４】
このように本発明の参考例７の送風機によれば、軸流羽根車２の外周部反り率Ｑｔと内周部反り率Ｑｂとの差を０．００１以上０．０２０以下で外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値、軸流羽根車２の外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差を０．１゜以上６゜以下で外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機１の騒音を低くすることができる。
【０１１５】
なお、参考例７では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、同等の効果を得ることができる。
【０１１６】
（参考例８）
つぎに本発明の参考例８について図１〜図１２および図２８を参照しながら説明する。なお、参考例２〜７、実施例７、８と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１１７】
図に示すように、参考例２、３、４、５、７および実施例７、８の構成に、軸流羽根車２の任意の直径ＤＤの翼断面１３における翼弦長Ｌと、回転軸４と垂直で翼６の前縁部７を通る直線である翼列線２４上で、翼６の前縁部７と翼６と隣り合う翼６の前縁部７との距離をピッチＴとしたとき、弦節比Ｓは、Ｓ＝Ｌ／Ｔで与え、弦節比Ｓは１．１以上１．９以下になる軸流羽根車２を有する構成にされている。
【０１１８】
上記構成により、翼弦長Ｌが変化しない場合、翼６の間隔つまりピッチＴを小さくする、つまり翼６の枚数を増やすことで高静圧時でも流れ２５を翼６に沿いやすくし、境界層の厚みを小さくすることで騒音の低減を図ることができる。しかし、ピッチＴを極端に小さくする、つまり翼６の枚数を増やしすぎると各々の翼６より発生する騒音の音源の数が翼６の枚数と等しいことから、軸流羽根車２全体での騒音が上昇する原因となる。そこでＳ＝Ｌ／Ｔで与えられる弦節比Ｓの最適化を、外周前進角Ａθｔは１０５゜、外周部反り率Ｑｔが外周部１１より内周側の任意の反り率Ｑより大きな値で外周部反り率Ｑｔと内周部反り率Ｑｂとの差を０．００８、外周部取付角Ｃθｔは外周部１１より内周側の任意の取付角Ｃθより大きな値で外周部取付角Ｃθｔと内周部取付角Ｃθｂとの差を２゜の最適の水準を用いて行なった。図２８に示すように弦節比Ｓは、１．１以上１．９以下で比騒音レベルＫｓが小さくなっていることがわかる。また弦節比Ｓは、１．５付近で最小の比騒音レベルＫｓになる。
【０１１９】
このように本発明の参考例８の送風機によれば、軸流羽根車２の翼６の弦節比Ｓは、１．１以上１．９以下の範囲で設計することにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【０１２０】
なお、参考例８では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、同等の効果を得ることができる。
【０１２１】
（参考例９）
つぎに本発明の参考例９について図１〜図１１を参照しながら説明する。なお、参考例１、実施例〜実施例６と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１２２】
図に示すように、参考例１、第１、２、３、４、５および実施例６の構成に、軸流羽根車２の回転軸４を含む平面で切断される任意の半径方向翼断面３５において、最も吸込側１８に位置する点を頂点２６とし、任意の半径方向翼断面３５における複数の頂点２６を結ぶ曲線２７が、翼６の前縁部７またはその前縁部７と外周部１１との交点から、後縁部８またはその後縁部８と内周部１２との交点まで通る軸流羽根車２を有する構成にされている。
【０１２３】
上記構成により、隣り合う翼６と翼６との間の流路３０の流れは、ハブ５とケーシング３１の境界層付近の流れ３２は、主流３３より小さく、翼６の反りＤによる遠心力も小さいので、圧力こう配により翼６の正圧面１６から負圧面１５に向かう流れ３４を生じる。しかし、軸流羽根車２の翼６の前縁部７と外周部１１との交点、後縁部８と内周部１２との交点を含まない、回転軸４を含む平面で切断される任意の半径方向翼断面３５において、最も吸込側１８に位置する頂点２６が、半径方向翼断面３５の外周縁２８または内周縁２９に存在しない負圧面１５側に凸形状であるために流れ３４は、半径方向翼断面３５の外周縁２８または内周縁２９で止められ、一対の流路渦の形成を防ぐことができる。また、流路渦が形成されにくいため随伴渦の形成を防ぐことができ、騒音の低減が可能となる。
【０１２４】
このように本発明の参考例９の送風機によれば、軸流羽根車２の回転軸４を含む平面で切断される任意の半径方向翼断面３５において、最も吸込側１８に位置する点を頂点２６とし、任意の半径方向翼断面３５における複数の頂点２６を結ぶ曲線２７が、翼６の前縁部７またはその前縁部７と外周部１１との交点から、後縁部８またはその後縁部８と内周部１２との交点まで通る形状にすることにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【０１２５】
なお、参考例９では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【０１２６】
また、軸流羽根車２の外周部１１に略円筒状のリング２２を設けることにより、軸流羽根車２が回転した際に起こる翼６の変形あるいは破壊を防ぐことを行っても同等の効果を得ることができ、翼６の変形あるいは破壊を防ぐ強度向上のための軸流羽根車２および翼６の形状はこの限りではない。
【０１２７】
（参考例１０）
つぎに本発明の参考例１０について図１〜図１２を参照しながら説明する。なお、参考例９と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１２８】
図に示すように実施例１７の構成に、軸流羽根車２の回転軸４を含む平面で切断される任意の半径方向翼断面３５において、最も吸込側１８に位置する点を頂点２６とし、また軸流羽根車２の翼６の内周部１２と後縁部８との交点を点Ｂｈとして、その点Ｂｈを通り回転軸４を直交する面を基準面Ｊとし、後縁部８と外周部１１との交点を点Ｂｋとするとき、頂点２６と点Ｂｋが基準面Ｊよりすべて吸込側１８に位置する軸流羽根車２を有する構成にされている。
【０１２９】
上記構成により、軸流羽根車２が回転し矢印Ｆの方向に遠心力がはたらき、翼６を吸込側１８に前傾させることで遠心力の負圧面１５の法線成分Ｆｖがはたらくことで、翼６の負圧面１５における負圧面境界層３５の厚みを抑えることができ、騒音を低減することができる。
【０１３０】
このように本発明の参考例１０の送風機によれば、翼６を吸込側１８に前傾させる形状にすることにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【０１３１】
なお、参考例１０では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【０１３２】
（参考例１１）
つぎに本発明の参考例１１について図１〜図１５を参照しながら説明する。なお、参考例１、２、実施例１〜実施例７と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１３３】
図に示すように、参考例１、２、第１、２、３、４、５、６および実施例７の構成に、送風機本体１の電動機３に係止される軸流羽根車２の回転軸４の軸方向に軸流羽根車２を投影したときに回転軸４に垂直な平面に映し出される投影図において、回転軸４を原点Ｏ、軸流羽根車２羽根径Ｄｔの０．４０８２倍の直径を仮想ハブ径ＫＤｈとし、その仮想ハブ径ＫＤｈを軸流羽根車２の翼６の前縁部７と後縁部８とで区切られできる仮想ハブ円弧ＫＡｈを２等分する点を仮想ハブ円弧中心点Ｋｈとして、原点Ｏと仮想ハブ円弧中心点Ｋｈを通る直線を直線Ｘ、原点Ｏを中心とする任意の直径ＤＤの円筒面で切断される翼６の翼弦投影線ＬＲを２等分する翼弦投影中心点ＰＲと原点Ｏを通る直線と直線Ｘのなす角を前進角Ａθとしたとき、翼６の翼外周部投影線を２等分する翼外周部投影中心点Ｐｔと原点Ｏを結ぶ直線と直線Ｘのなす角、つまり外周前進角Ａθｔは軸流羽根車２の回転方向１０を正方向とし５５゜以上１８０゜以下であり、外周部１１より内周側の任意の前進角Ａθは外周前進角Ａθｔより小さな値をとり、かつ、羽根径Ｄｔとする軸流羽根車２のハブ５のハブ径Ｄｈは、０＜Ｄｈ≦Ｄｔ（１−３２．５４９／Ａθｔ）の範囲であり、かつ、軸流羽根車２の羽根径Ｄｔとハブ径Ｄｈで代表径ＤｍはＤｍ＝（（（０．９６Ｄｔ）2−（１．０４Ｄｈ）2）／２）1/2で与え、代表径Ｄｍにおける代表径前進角Ａθｄは、外周前進角Ａθｔの２０％以上５５％以下の値をとる軸流羽根車２を有する構成にされている。
【０１３４】
上記構成により、代表径Ｄｍにおける代表径前進角Ａθｄは、外周前進角Ａθｔの２０％以上５５％以下の値で、翼６の外周部１１付近が回転方向１０に特に突き出た形状である。遠心力により翼６の負圧面１５の境界層内で内周部１２から外周部１１に向かって二次流れ１７が誘起されるが、軸流羽根車２の翼６は、外周部１１付近が回転方向１０に特に突き出た形状であるため二次流れ１７は後縁部８より放出することができ、外周部１１での低エネルギー流体の集積を防ぎ、騒音を低減することができる。
【０１３５】
また、外周部１１付近が回転方向１０に特に突き出た形状であるために、前縁部７の外周部１１は内周側の二次流れ１７の影響を受けることはないので、外周部１１の吸込側１８付近での逆流２０の発生も起こりにくい。よって、軸流送風機特有の回転が不安定になり騒音が急上昇しファン効率が低下するサージング現象を発生しにくく、高静圧側へ移動できるために軸流羽根車２の使用領域を増やすことができる。
【０１３６】
このように本発明の参考例１１の送風機によれば、代表径Ｄｍにおける代表径前進角Ａθｄは、外周前進角Ａθｔの２０％以上５５％以下の値で、翼６の外周部１１付近が回転方向１０に特に突き出た形状にすることにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することと、軸流送風機特有の回転が不安定になり騒音が急上昇しファン効率が低下するサージング現象を発生しにくく、高静圧側へ移動できるために軸流羽根車２の使用領域を増やすことができ、小型で高静圧、大風量の送風機本体１の騒音を低くすることができる。
【０１３７】
なお、参考例１では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【０１３８】
また、軸流羽根車２の外周部１１に略円筒状のリング２２を設けることにより、軸流羽根車２が回転した際に起こる翼６の変形あるいは破壊を防ぐことを行っても同等の効果を得ることができ、翼６の変形あるいは破壊を防ぐ強度向上のための軸流羽根車２および翼６の形状はこの限りではない。
【０１３９】
（参考例１２）
つぎに本発明の参考例１２について図１〜図１６を参照しながら説明する。なお、参考例１〜１１、実施例１〜実施例８と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１４０】
図に示すように、軸流羽根車２の回転軸４を中心とする任意の直径ＤＤの円筒面Ｖと、翼６の前縁部７との交点Ｒｆとし、その交点Ｒｆを通り回転軸４に平行な直線を含む任意の平面を平面Ｕとして、その平面Ｕと翼６とでできる略円弧状の翼断面１３において、入口角β１が９０゜以上１８０゜以下の軸流羽根車２を有する構成にされている。
【０１４１】
上記構成により、機器の小型化、機器性能の使用範囲の拡大をするために非常に高い静圧を必要とし、翼６の正圧面１６と負圧面１５との圧力差が大きくなり、流れ３６は翼６の直前で急激に負圧面１５側に誘引される。そこで翼断面１３において入口角β１が９０゜以上１８０゜以下であるために流れ３６は翼６に沿うため、翼６の前縁部７からの剥離を防ぐことができ、騒音の低減が可能となる。
【０１４２】
このように本発明の参考例１２の送風機によれば、翼断面１３において、入口角β１が９０゜以上１８０゜以下の形状にすることにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【０１４３】
なお、参考例１では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【０１４４】
また、軸流羽根車２の外周部１１に略円筒状のリング２２を設けることにより、軸流羽根車２が回転した際に起こる翼６の変形あるいは破壊を防ぐことを行っても同等の効果を得ることができ、翼６の変形あるいは破壊を防ぐ強度向上のための軸流羽根車２および翼６の形状はこの限りではない。
【０１４５】
また、参考例１〜１１、実施例１〜実施例８の羽根車を軸流羽根車２とするとさらに騒音の低減ができなお良い。
【０１４６】
（実施例２１）
つぎに本発明の参考例１３について図１〜図１７を参照しながら説明する。なお、参考例１〜１２、実施例１〜実施例８と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１４７】
図に示すように、送風機本体１の電動機３に係止されるハブ５に複数の翼６があり、その翼６に電動機３の回転軸４を中心とする円筒状のリング４０を取り付けた軸流羽根車２において、ハブ５に接続しないように補助翼３７をリング４０の外周側３８または内周側３９に取り付けた前記軸流羽根車を有する構成にされている。
【０１４８】
上記構成により、機器の小型化、機器性能の使用範囲の拡大をするために非常に高い静圧を必要とし、小型で高静圧、大風量を得る必要がある。軸流羽根車２を同一回転数で仕事量を増やすために、翼６の枚数を増やす方法がある。しかし、翼６の枚数を増やすとハブ５と翼６の接続部付近では、翼６と翼６との間隔が狭まり、流路３０が確保できなくなり、軸流羽根車２の騒音の上昇、ファン効率の低下につながる。そこで、ハブ５に接続しないように補助翼３７をリング４０の外周側３８または内周側３９に取り付けているので、補助翼３７により軸流羽根車２の仕事量を同一回転数で増やすことができ、同一仕事量では軸流羽根車２の騒音を低減することができる。
【０１４９】
このように本発明の参考例１３の送風機によれば、ハブ５に接続しないように補助翼３７をリング４０の外周側３８または内周側３９に取り付けることにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【０１５０】
なお、参考例１３では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【０１５１】
またリング４０は円筒状としているが、補助翼３７を取り付けるためのものであり、リング４０の形状はこの限りではない。
【０１５２】
また、参考例１〜１２、実施例１〜実施例８の羽根車を軸流羽根車２とするとさらに騒音の低減ができなお良い。
【０１５３】
（参考例１４）
つぎに本発明の参考例１４について図１〜図１８を参照しながら説明する。なお、参考例１〜１３、実施例１〜実施例８と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１５４】
図に示すように、参考例１、２、３、４、５、６、７、８、９、１０、１１、１２、１３、第１、２、３、４、５、６、７および実施例８の構成に、送風機本体１の電動機３に係止されるハブ５に複数の翼６があり、その翼６の外周部１１に電動機３の回転軸４を中心とする円筒状のリング２２を取り付けた軸流羽根車２において、リング２２の外周側３８に植毛材４１を付けた軸流羽根車２を有する構成にされている。
【０１５５】
上記構成により、機器の小型化、機器性能の使用範囲の拡大をするために非常に高い静圧を必要とし、軸流羽根車２の吸込側１８と吐出側１９では圧力差が大きくなる。軸流羽根車２とケーシング３１には隙間４２があり、この隙間４２から圧力差により吐出側１９から吸込側１８へ逆流または圧力漏れが発生する。しかし、軸流羽根車２のリング２２の外周側３８に植毛材４１を付けているために、逆流または圧力漏れを防ぐことができ、さらに植毛材４１とケーシング３１は回転中接触しても騒音が発生しにくく、軸流羽根車２の騒音を低減とファン効率の向上ができる。
【０１５６】
このように本発明の参考例１４の送風機によれば、軸流羽根車２のリング２２の外周側３８に植毛材４１を取り付けていることにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【０１５７】
なお、参考例１４では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【０１５８】
また、参考例１〜１３、実施例１〜実施例８の羽根車を軸流羽根車２とするとさらに騒音の低減ができなお良い。
【０１５９】
（参考例１５）
つぎに本発明の参考例１５について図１〜図１９を参照しながら説明する。なお、参考例１〜１４、実施例１〜実施例８と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１６０】
図に示すように、参考例１、２、３、４、５、６、７、８、９、１０、１１、１２、１３、１４、第１、２、３、４、５、６、７および実施例８の構成に、送風機本体１の電動機３に係止されるハブ５に複数の翼６があり、その翼６の外周部１１に電動機３の回転軸４を中心とする円筒状のリング２２を取り付けた軸流羽根車２において、リング２２の外周側３８の形状が凹凸状である軸流羽根車２を有する構成にされている。
【０１６１】
上記構成により、機器の小型化、機器性能の使用範囲の拡大をするために非常に高い静圧を必要とし、軸流羽根車２の吸込側１８と吐出側１９では圧力差が大きくなる。軸流羽根車２とケーシング３１には隙間４２があり、この隙間４２から圧力差により吐出側１９から吸込側１８へ逆流または圧力漏れが発生する。しかし、軸流羽根車２のリング２２の外周側３８の形状が凹凸状であるために、逆流４３通過する際、凹部４４で逆流４３がよどみ凸部４５でくい止められようとし、凹部４４と凸部４５が連続してあるため逆流を防ぐことができ、軸流羽根車２の騒音の低減とファン効率の向上ができる。
【０１６２】
このように本発明の参考例１５の送風機によれば、軸流羽根車２のリング２２の外周側３８の形状が凹凸状であることにより、小型で高静圧、大風量を得る際の軸流羽根車２の高回転化による騒音の上昇を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【０１６３】
なお、参考例１５では送風機の羽根車を軸流羽根車２としたが、斜流羽根車２１としても、羽根外径Ｄｔ、仮想ハブ径ＫＤｈ、ハブ径Ｄｈを吸込側１８と吐出側１９の平均値とすることで同等の効果を得ることができるので、羽根車は斜流羽根車２１でも良い。
【０１６４】
また、参考例１〜１４、実施例１〜実施例８の羽根車を軸流羽根車２とするとさらに騒音の低減ができなお良い。
【０１６５】
（参考例１６）
つぎに本発明の参考例１６について図１〜図２１を参照しながら説明する。なお、参考例１〜１５、実施例１〜実施例８と同一箇所には同一番号を付けて詳細な説明は省略する。
【０１６６】
図に示すように、送風機本体１の電動機３に係止される斜流羽根車２１の回転軸４を中心とする任意の吸込側直径Ｄ１と任意の吐出側直径Ｄ２でできる円錐台Ｚで翼６を切断して、断面を２次元に展開してできる翼断面１３で、負圧面１５側に反りの極大点４６が２ヶ所あるＭ字型の中心線１４の翼６の斜流羽根車２１を有する構成にされている。
【０１６７】
上記構成により、機器の小型化、機器性能の使用範囲の拡大をするために非常に高い静圧を必要とする。そこで負圧面１５側に反りの極大点４６が２ヶ所あるＭ字型の中心線１４の翼６であるために、翼６に流入された流れ５０は前縁側４７の極大点４６による翼６の反りにより圧力上昇を行い、翼６の中央部の極小点４９付近で流れ５０は斜流羽根車２１特有の半径方向の成分を持ち、遠心作用によりさらに圧力上昇を行い、つぎに流れ５０は翼６の後縁側４８の極大点４６による翼６の反りで圧力上昇をして軸方向に流れ、翼６より流出することにより、低回転で高静圧を得ることができ、騒音の低減ができる。
【０１６８】
このように本発明の参考例１６の送風機によれば、負圧面１５側に反りの極大点４６が２ヶ所あるＭ字型の中心線１４の翼６であるために、小型で高静圧、大風量を得る際の斜流羽根車２の騒音を抑制することができ、小型で高静圧、大風量の送風機の騒音を低くすることができる。
【０１６９】
なお、軸流羽根車２の外周部１１に略円筒状のリング２２を設けることにより、軸流羽根車２が回転した際に起こる翼６の変形あるいは破壊を防ぐことを行っても同等の効果を得ることができ、翼６の変形あるいは破壊を防ぐ強度向上のための軸流羽根車２および翼６の形状はこの限りではない。
【０１７０】
（参考例１７）
つぎに本発明の参考例１７について図２９および図３０を参照しながら説明する。
【０１７１】
図に示すように、内面が円筒面状の枠体６１内部に軸方向に設置された放射状の複数の脚部６２を有する略円筒状の電動機ケース６３とこの内部に設置される電動機６４の回転軸端部６５に軸流羽根車６６が係止された送風機６７において、脚部６２の羽根車側の軸方向端部６８から軸流羽根車６６の間に、枠体６１の内周面に接する外周縁６９の長さが、電動機ケース６３の外周面に接する内周縁７０の長さよりも長い一定曲率を有する静翼７１と、この静翼７１の凸面における外周側入口部７２ｔおよび内周側入口部７２ｈにおいて断面が半円状の肉厚部７３ｔおよび７３ｈを配設してなる構成となっている。
【０１７２】
上記構成により、軸流羽根車６６を通過した流れａは、圧力増加されるとともに速度三角形から、旋回成分を有する回転方向に角度をもつ絶対速度Ｃ2の流れとなる。この流れが静翼７１に流入する際、中心軸に対する流入角度αｓは径方向位置で変化し、理想的な状態では内周側から外周側の位置になるに従って大きくなる。ところが実際は、旋回成分をもちつつ、高回転による遠心力の影響で径方向にも広がる斜流流れとなるため、特に外周側では静翼７１に流入するまでに、主流流れが枠体６１の内周面をはね返る２次流れと干渉して流入角度αｓが一定に定まらず、様々な流入角度αｓをもった流れとなる。また、内周側では、静翼７１に流入するまでに、逆流現象の影響で様々な流入角度αｓをもった流れとなる。このとき、静翼７１の凸面側（負圧面側）の外周側入口部７２ｔおよび内周側入口部７２ｈにおいて肉厚部７３ｔおよび７３ｈが形成されているためどの流入角度に対してもなめらかに迎え入れることができ、凸面側の剥離および渦の発生を抑制し流体損失を低減できる。
【０１７３】
なお、肉厚部７３ｔおよび７３ｈの断面直径は静翼７１の周方向断面の弦長Ｌの３％から１０％の範囲が望ましく、径方向長さは静翼７１径方向高さＨの３０％以下が望ましい。
【０１７４】
また、軸流羽根車６６と静翼７１の再接近距離は軸流羽根車６６の羽根外径Ｄｔの１５％以上が望ましい。
【０１７５】
また、参考例１から１６記載のいずれかあるいは、請求項１から８記載のいずれかの軸流羽根車を用いれば、小型化が可能となり、送風機としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０１７６】
また、軸流羽根車６６を斜流羽根車にかえてもよく、その作用効果に差異は生じない。
【０１７７】
このように本発明の参考例１７の送風機によれば、静翼流入時の外周側および内周側における流体損失を低減し効率よく旋回エネルギを圧力エネルギへ変換でき、全圧効率が増加し消費電力が低減できる。また、作動点（静圧・風量）が同じなら回転数を低減でき、騒音を低減することができる。
【０１７８】
（参考例１８）
つぎに本発明の参考例１８について図２９および図３１を参照しながら説明する。なお、実施例２５と同一箇所には同一番号を付し、詳細な説明は省略する。
【０１７９】
図に示すように、静翼７１の凹面（正圧面）における外周側入口部７４ｔおよび内周側入口部７４ｈにおいて断面が半円状の肉厚部７５ｔおよび７５ｈを配設してなる構成となっている。
【０１８０】
上記構成において、軸流羽根車６６と静翼７１の間において、特に外周側と内周側における静翼７１への流入角度が様々に乱れた流れａは、静翼７１への流入時に肉厚部７５ｔおよび７５ｈによって滑らかに迎え入れられ、凹面側の剥離および渦の発生を抑制し、流体損失を低減できる。
【０１８１】
なお、肉厚部７５ｔおよび７５ｈの断面直径は静翼７１の周方向断面の弦長Ｌの３％から１０％の範囲が望ましく、径方向長さは静翼７１径方向高さＨの３０％以下が望ましい。
【０１８２】
また、軸流羽根車６６と静翼７１の再接近距離は軸流羽根車６６の羽根外径Ｄｔの１５％以上が望ましい。
【０１８３】
また、参考例１から１６記載のいずれかあるいは、請求項１から８記載のいずれかの軸流羽根車を用いれば、小型化が可能となり、送風機としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０１８４】
また、参考例１７記載の肉厚部も用いると更に流体損失を低減できる。
【０１８５】
また、軸流羽根車６６を斜流羽根車にかえてもよく、その作用効果に差異は生じない。
【０１８６】
このように本発明の参考例１８の送風機によれば、参考例１７の作用効果に加えて、静翼流入時の外周側および内周側における流体損失を実施例２５以上に低減し効率よく旋回エネルギを圧力エネルギへ変換でき、全圧効率が増加し消費電力が低減できる。
【０１８７】
（参考例１９）
つぎに本発明の参考例１９について図３２および図３３を参照しながら説明する。なお、参考例１７および参考例１８と同一箇所には同一番号を付し、詳細な説明は省略する。
【０１８８】
図に示すように、径方向の高さが静翼の高さＨの３０％以下で前端７６の高さが後端７７の高さ以下であり、静翼７１の外周側入口部７８の入口角度βｓに対し、βｓ−５゜＜βｓ’＜βｓ＋５゜を満たす入口角度α’を有する補助静翼７９を静翼７１から軸流羽根車６６の間の枠体６１の内周面に複数枚配設してなる構成となっている。
【０１８９】
上記構成において、軸流羽根車６６と外周側入口部７８の間における特に最外周側において、軸流羽根車６６を通過した流れａは、主流流れが２次流れと干渉し乱れた流れに発達する前に、補助静翼７９により整流化され外周側入口部７８の入口角度βｓに近い流入角度となって静翼７１に流入することとなり、流入時の流体損失を低減することができる。
【０１９０】
なお、参考例１から１６記載のいずれかあるいは、請求項１から８記載のいずれかの軸流羽根車を用いれば、小型化が可能となり、送風機としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０１９１】
また、参考例１７または参考例１８のいずれか記載、または両方の肉厚部を用いれば、更に流体損失を低減できる。
【０１９２】
また、軸流羽根車６６を斜流羽根車にかえてもよく、その作用効果に差異は生じない。
【０１９３】
このように本発明の参考例１９の送風機によれば、静翼流入時の外周側における流体損失を低減し効率よく旋回エネルギを圧力エネルギへ変換でき、全圧効率が約５％増加し消費電力が低減できる。また、作動点（静圧・風量）が同じなら回転数を低減でき、騒音を低減することができる。
【０１９４】
（参考例２０）
つぎに本発明の参考例２０について図３４を参照しながら説明する。なお、参考例１７から参考例１９と同一箇所には同一番号を付し、詳細な説明は省略する。
【０１９５】
図に示すように、静翼７１の外周側から内周側に向かって、静翼７１の径方向高さＨの３０％以下の範囲内において、略円筒状の薄肉リング８０を静翼７１に係止してなる構成となっている。
【０１９６】
上記構成において、軸流羽根車６６と静翼７１の間における特に外周側において、軸流羽根車６６を通過した流れａは、主流流れが２次流れと干渉し乱れた流れに発達するが、この発達領域は静翼７１への流入前から通過途中においても外周から内周に向かって径方向に発達しようとするが、薄肉リング８０によって分離整流化され、主流流れに及ぼす２次流れの影響を抑制でき、静翼７１通過時の流体損失を低減することができる。
【０１９７】
なお、薄肉リング８０の軸方向長さは径方向における薄肉リング８０の設置位置での静翼７１の軸方向長さの１から１．２倍の長さが望ましく、薄肉リングの前端８１と軸流羽根車６６との再接近距離は羽根外径Ｄｔの１０％以上が望ましい。
【０１９８】
また、前端８１を軸流羽根車６６通過後の斜流流れに留意して、この斜流流れに沿った屈曲部を形成すると更に効果が上がる。
【０１９９】
また、参考例１から１６記載のいずれかあるいは、請求項１から８記載のいずれかの軸流羽根車を用いれば、小型化が可能となり、送風機としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２００】
また、参考例１７、１８または１９記載の静翼を用いれば更に流体損失を低減できる。
【０２０１】
また、軸流羽根車６６を斜流羽根車にかえてもよく、その作用効果に差異は生じない。
【０２０２】
このように、本発明の参考例２０の送風機によれば、外周から内周へ径方向に発達しようとする２次流れを薄肉リングで分離整流化することで流体損失を低減し効率よく旋回エネルギを圧力エネルギへ変換でき、全圧効率が増加し消費電力が低減できる。また、作動点（静圧・風量）が同じなら回転数を低減でき、騒音を低減することができる。
【０２０３】
（参考例２１）
つぎに本発明の参考例２１について図３５を参照しながら説明する。なお、参考例１７から参考例２０と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２０４】
図に示すように、静翼の外周側入口部７８から軸流羽根車６６の間の枠体６１内周面に静翼７１の径方向高さＨの１０％以下の高さの羽毛状突起物８２を多数植付けた構成となっている。
【０２０５】
上記構成において、軸流羽根車６６と外周側入口部７８の間における特に最外周側において、軸流羽根車６６を通過した流れａは、主流流れが２次流れと干渉し渦を生成し、この渦が大きく発達しようとするが、羽毛状突起物８２により渦が細かく分解され、外周から内周へ向かう径方向への渦を含む乱れた流れも軽減でき、流体損失を低減できる。
【０２０６】
なお、参考例１から１６記載のいずれか、あるいは請求項１から８記載のいずれかの軸流羽根車を用いれば、小型化が可能となり、送風機としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２０７】
また、参考例１７、１８または２０記載の静翼を用いれば更に流体損失を低減できる。
【０２０８】
また、軸流羽根車６６を斜流羽根車にかえてもよく、その作用効果に差異は生じない。
【０２０９】
このように、本発明の参考例２１の送風機によれば、外周部における渦の生成および発達を軽減でき、流体損失を低減し効率よく旋回エネルギを圧力エネルギへ変換でき、全圧効率が増加し消費電力が低減できる。また、作動点（静圧・風量）が同じなら回転数を低減でき、騒音を低減することができる。
【０２１０】
（参考例２２）
つぎに本発明の参考例２２について図１および図３６を参照しながら説明する。なお、参考例１および参考例１７から参考例２１と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２１１】
図に示すように、下面を開口し、上面の一部に排気口９１を有するフード本体９２と、このフード本体９２の内部において、フィルタ９３および断面がベルマウス形状または略台形形状の吸込オリフィス９４とこの吸込オリフィス９４を吸込口９５に付設し、フィルタ９３と排気口９１の間に配設された軸流羽根車６６を有する送風機本体１を備えた構成となっている。
【０２１２】
上記構成において、油煙などを含む空気の流れはフード本体９２の下面開口部より流入し、フィルタ９３で油煙分が除去され、吸込オリフィス９４から送風機本体１に流入し排気口９１からダクト９６を通過して室外に排気される。このとき、送風機本体１は従来用いられてきた遠心型の送風機よりも小型である時、フード内部における送風機本体を除いた容積が従来のフード本体内の送風機本体をのぞいた容積と同等なら、フード本体９２の高さをより低くすることができ、フード本体９２の軽量化および低コスト化が可能となる。また、この送風装置がレンジフードとして使用される場合、フード高さを低くすることでキッチンの美観が損なわれない。
【０２１３】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２１４】
このように本発明の参考例２２の送風装置によれば、フード高さを低くすることができるので、フード本体の軽量化および低コスト化を実現できる。
【０２１５】
（参考例２３）
つぎに本発明の参考例２３について図１および図３７を参照しながら説明する。なお、参考例１および参考例１７から参考例２２と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２１６】
図に示すように下面を開口し、上面の一部に排気口９１を有するフード本体９７と、このフード本体９７の内部にフィルタ９３および断面がベルマウス形状または略台形状の吸込オリフィス９４と、フード本体９７の外部に排気口９１と室外を連通するダクト９６と、このダクト９６の中間部または端部に接続配設された軸流羽根車６６を有する送風機本体１を備えた構成となっている。
【０２１７】
上記構成において、送風機本体１が従来の遠心型の送風機本体よりも小型である時、軸流方向流れであるのでフード本体９７の外部のダクト９６の中間部または端部に容易に接続することができる。また、フード本体９７の内部にはフィルタ９３および吸込オリフィス９４のみ配設されることからフード高さを実施例３０よりも更に低くすることができ、フード本体９７の更なる軽量化および低コスト化が可能となる。また、この送風装置がレンジフードとして使用される場合、フード高さを低くすることで吊り戸棚スペースを確保でき、キッチンの美観が損なわれない。
【０２１８】
なお、送風機本体１はダクト９６の端部に接続される際、室外と室内を仕切る壁体９８間に軸方向長さの一部または全部が挿脱可能に配設されることや、室外側の壁面に配設されることで、メンテナンス性が向上する。
【０２１９】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２２０】
このように、本発明の参考例２３の送風装置によれば、送風機本体をフード本体の外部に配設することによりフード高さを更に低くすることができるので、実施例３０以上のフード本体の軽量化および低コスト化を実現できる。
【０２２１】
（参考例２４）
つぎに本発明の参考例２４について図１および図３８を参照しながら説明する。なお、参考例１および参考例１７から参考例２３と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２２２】
図に示すように、下面を開口し、上面または背面の一部に排気口９１を有するフード本体９９と、このフード本体９９内部にフィルタ９３が設置され、断面がベルマウス形状または略台形形状の吸込オリフィス９４を吸込口９５に付設した軸流羽根車６６を有する送風機本体１の一部がフード本体９９内に突出し、他部が前記フード本体９９外に突出するように排気口９１において、挿脱可能に係止された構成となっている。
【０２２３】
上記構成において、送風機本体１が従来の遠心型の送風機本体よりも小型である時、上面の排気口９１において、送風機本体１の一部がフード本体９９内に突出しているだけなので、フード本体９２内部における送風機本体１の一部を除いた容積が実施例３０のフード本体内の送風機本体をのぞいた容積と同等なら、フード本体９９のフード高さを実施例３０より更に低くすることができ、送風機本体１が挿脱可能なことからメンテナンス性が向上し、フード高さを送風機本体の径方向の外径寸法以上に設定することで、フード内に収納した状態で梱包・運送することができ、流通コストも削減できる。また、この送風装置がレンジフードとして使用される場合、フード高さを低くすることで吊り戸棚スペースを確保でき、キッチンの美観が損なわれない。
【０２２４】
なお、背面の一部に排気口９１が設けられた場合の送風機本体１の設置に関してもその作用効果に差異は生じない。
【０２２５】
また、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２２６】
このように、本発明の参考例２４の送風装置によれば、送風機本体をフード本体の内外に渡って挿脱可能に配設することによりフード高さを実施例３０より更に低くすることができるので、実施例３０以上のフード本体の軽量化および低コスト化を実現できる。
【０２２７】
（参考例２５）
つぎに本発明の参考例２５について図１および図３９を参照しながら説明する。なお、参考例１および参考例１７から参考例２４と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２２８】
図に示すように、フィルタ面の孔径ｄを吸込オリフィス９４近傍から離れるにしたがって大きくしたフィルタ１００を備えた排煙用の送風装置としたものである。
【０２２９】
上記構成において、油煙を含んだ空気がフード本体９９内に設置されるフィルタ１００に流入する際、フィルタ面に形成される孔径ｄが吸込オリフィス９４近傍から離れるに従って大きくなるので、従来の穴径が同一のフィルタの場合では吸込オリフィス９４近傍のフィルタ面のみの空気の通過量が増大し、通過量に偏りが生じ、捕集性が悪くなりフィルタ劣化も早くなるのに対し、吸込オリフィス９４近傍のフィルタ面の空気の通過量が減り、ほぼ均一にフィルタ全面から流入・通過されることとなり、捕集性およびフィルタ寿命が向上する。
【０２３０】
なお、フィルタ１００の設置に関しては、フード本体９９内におけるフィルタ１００に対する上流側空間の容積が同等なら、設置位置はこの限りではない。
【０２３１】
また、フィルタ１００と吸込オリフィス９４の再接近距離は送風機本体１の吸込口径Ｄｉの３０％以上が望ましい。
【０２３２】
また、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２３３】
このように、本発明の参考例２５の送風装置によれば、参考例２２、２３または２４の作用効果に加えて、捕集性およびフィルタ寿命を向上させることが可能となる。
【０２３４】
（参考例２６）
つぎに本発明の参考例２６について図１および図４０を参照しながら説明する。なお、参考例１および参考例１７から参考例２５と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２３５】
図に示すように、内面が円筒面状の本体１０１の上流側の側面および下流側の上面に本体１０１の内外を連通するスリット状の開口部１０２ｉおよび１０２ｏを有し、この上流側の開口部１０２ｉの内側にフィルタ１０３を配設した構成となっている。
【０２３６】
上記構成において、開口部１０２ｉが本体１０１の側面に形成されているため、本体１０１の全周から汚れた空気を流入でき、軸流羽根車６６を小型にすれば、従来の特に遠心羽根車を用いた空気清浄用の送風装置に比して、本体の大きさを大幅に小型・軽量化でき、持ち運び自由となり、この送風装置１つで必要な様々な場所に移設できる。
【０２３７】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２３８】
また、開口部１０２ｉおよび１０２ｏの形状、形成位置に関しては、各々の開口面積が等しければ、本実施例に限らない。
【０２３９】
また、小型・軽量化により、材料・梱包・運送コストも低減できる。このように本発明の実施例３４の送風装置によれば、集塵範囲および方向を拡大でき、小型で軽量の低コストの空気清浄用送風装置を実現できる。
【０２４０】
（参考例２７）
つぎに本発明の参考例２７について図１および図４１を参照しながら説明する。なお、参考例１および参考例１７から参考例２６と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２４１】
図に示すように、内面が円筒面状の本体１０４の上流側の側面および下流側の上面に本体１０４の内外を連通するスリット状の開口部１０５ｉおよび１０５ｏを有し、この下流側の開口部１０５ｏの内側にフィルタ１０６を配設した構成となっている。
【０２４２】
上記構成において、実施例３４と同様に開口部１０５ｉが本体１０４の側面に形成されているため、本体１０４の全周から汚れた空気を流入でき、軸流羽根車６６を小型にすれば、従来の特に遠心羽根車を用いた空気清浄用の送風装置に比して、本体の大きさを大幅に小型・軽量化でき、持ち運び自由となり、この送風装置１つで必要な様々な場所に移設できる。
【０２４３】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２４４】
また、開口部１０５ｉおよび１０５ｏの形状、形成位置に関しては、各々の開口面積が等しければ、本実施例に限らない。
【０２４５】
また、小型・軽量化により、材料・梱包・運送コストも低減できる。
【０２４６】
このように本発明の参考例２７の送風装置によれば、集塵範囲および方向を拡大でき、小型で軽量の低コストの空気清浄用送風装置を実現できる。
【０２４７】
（参考例２８）
つぎに本発明の参考例２８について図１および図４２を参照しながら説明する。なお、参考例１および参考例１７から参考例２７と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２４８】
図に示すように、フィルタを超高性能フィルタ１０７とした構成となっている。
【０２４９】
上記構成において、通常の空気清浄用のフィルタに対し、微細な塵埃も集塵できる超高性能フィルタ１０７（ＨＥＰＡなど）の通風時の圧力損失は増加するが、搭載する送風機は高静圧が実現できる送風機であるため、圧力損失の増加を充分補うことができ、本体１０１や開口部１０２ｉおよび１０２ｏの開口面積を増加させる必要はない。
【０２５０】
このように本発明の参考例２８の送風装置によれば、実施例３４または３５の作用効果に加えて、超高性能フィルタを設置することで、送風性能を損なうことなく、集塵性能を向上できる。
【０２５１】
（参考例２９）
つぎに本発明の参考例２９について図１および図４３を参照しながら説明する。なお、参考例１および参考例１７から参考例２８と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２５２】
図に示すように、本体１０１の側面の一部に全周にわたって光が透過するアクリル材等を用いたスリット窓１０９を有し、照明機器１０８を電動機６４の端部に付設した構成となっている。
【０２５３】
上記構成において、搭載する送風機は、小型、高静圧および低騒音を実現できる送風機となっているので、住宅内の居間では間接照明に、また寝室では足下の照明に設置することができ、インテリア性が向上し、持ち運び便利なので、様々な照明用途に対応できる。
【０２５４】
このように本発明の参考例２９の送風装置によれば、参考例２６、２７または２８の作用効果に加えて、多様な照明用途に対応することができる。
【０２５５】
（参考例３０）
つぎに本発明の参考例３０について図１および図４４を参照しながら説明する。なお、参考例１および参考例１７から参考例２９と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２５６】
図に示すように断面がベルマウス形状または略台形状を有する吸込オリフィス１１１と回転手段を有した本体取付金具１１２を配設した構成となっている。
【０２５７】
上記構成において、本体取付金具１１２の一方の端部を送風機本体１に、他方の端部を
室内側の壁面に固着することで、夏期使用時は吸込オリフィス１１１の開口部を床面側に向けることにより、空調機等で冷やされた床面付近の空気を天井側に循環させることができ、室内空間における温度分布の均一化が図れる。また、冬期使用時は吸込オリフィス１１１の開口部を回転手段を有する本体取付金具１１２により天井面側に向けることにより、空調機等で暖められた天井面付近の空気を床面側に循環させることができ、室内空間における温度分布の均一化が図れる。
【０２５８】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２５９】
このように本発明の参考例３０の送風装置によれば、サーキュレーション作用により、室内空間における温度分布の均一化を図ることができる。
【０２６０】
（参考例３１）
つぎに本発明の参考例３１について図１および図４５を参照しながら説明する。なお、参考例１および参考例１７から参考例３０と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２６１】
図に示すように断面がベルマウス形状または略台形状を有する吸込オリフィス１１１と、回転手段を有した本体取付金具１１２と、一方の開口端部が丸穴形状で、他方の開口端部が細長の角穴形状で、この角穴内に１個ないし複数個の風向フィン１１３を備えた線状吹き出し拡散ルーバ１１４を備え、この線状吹き出し拡散ルーバ１１４の丸穴の開口端部を吹き出し口１１５に接続した構成となっている。
【０２６２】
上記構成において、線状吹き出し拡散ルーバ１１４の細長の開口部面積を他方の開口部面積より小さくすることで、流速を増加させることができ、広い居室空間の壁面にこの送風装置を取り付けてもサーキュレーション作用が十分可能となる。また、風向フィン１１３の向きを変えることで、吹き出し流の方向を局所的または拡散的に変化させることも可能となる。
【０２６３】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２６４】
このように本発明の参考例３１の送風装置によれば、線状吹き出し拡散ルーバにより吹き出し流の流速を増加させることでサーキュレーション作用の範囲を拡大でき、風向フィン１１３により吹き出し流の方向を自由に変えることができる。
【０２６５】
（参考例３２）
つぎに本発明の参考例３２について図１および図４６を参照しながら説明する。なお、参考例１および参考例１７から参考例３１と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２６６】
図に示すように、断面がベルマウス形状または台形状を有する吸込オリフィス１１１と、回転手段を有した本体取付金具１１２と、断面がベルマウス形状または台形状で、内部に略円錐形状のガイド１１６を備えた環状吹き出し拡散ルーバ１１７を備え、この環状吹き出し拡散ルーバ１１７を吹き出し口１１５に接続した構成となっている。
【０２６７】
上記構成において、環状吹き出し拡散ルーバ１１７の下流側の開口部面積を上流側の開
口部面積よりも小さくすることで吹き出し流の流速を増加させることができ、更に環状吹き出し拡散ルーバ１１７内のガイド１１６により環状吹き出しとなるため、特に天井高の高い居室空間の天井面や壁面にこの送風装置を取り付けても広範囲なサーキュレーション作用が十分可能となる。
【０２６８】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２６９】
このように本発明の参考例３２の送風装置によれば、環状吹き出し拡散ルーバにより広範囲なサーキュレーション作用を実現できる。
【０２７０】
（参考例３３）
つぎに本発明の参考例３３について図１および図４７を参照しながら説明する。なお、参考例１および参考例１７から参考例３２と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２７１】
図に示すように断面がベルマウス形状または略台形状を有する吸込オリフィス１１１と、回転手段を有した本体取付金具１１２と、略円筒状で内部に１個ないし複数個の風向フィン１１８と、回転軸４の周方向に回転する回転手段を有した回転拡散ルーバ１１９を備え、この回転拡散ルーバ１１９を吹き出し口１１５に接続した構成となっている。
【０２７２】
上記構成において、風向フィン１１８を全て同一方向（１個の場合はある方向）に向けても回転拡散ルーバ１１９自体が回転軸４の周方向に回転する回転手段により回転するため、多くの風量を広範囲に行き渡らせることができ、広い居室空間の天井面や壁面にこの送風装置を取り付けてもサーキュレーション作用が向上する。
【０２７３】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２７４】
このように本発明の参考例３３の送風装置によれば、回転拡散ルーバにより大風量で広範囲なサーキュレーション作用を実現できる。
【０２７５】
（参考例３４）
つぎに本発明の参考例３４について図１および図４８を参照しながら説明する。なお、参考例１および参考例１７から参考例３３と同一箇所には同一番号を付し、詳細な説明は省略する。
【０２７６】
図に示すように一方または両方の対向する側壁１２１の上下または、一方の側壁１２１の上方と対向する他方の側壁１２１の下方に給排用の開口部１２２を有し、この上方と下方の開口部１２２間の側壁面に点検口１２３および点検扉１２４を有した箱体状の壁用建材ユニット１２５の内部に配設した構成となっている。
【０２７７】
上記構成において、高静圧で大風量の送風機本体１を点検口１２３から建材ユニット１２５の内部空間に設置し、建材ユニット１２５の内部空間の気密性を高めることで、開口部１２２からの空気の流入出が可能となる。また、接続ダクトを配管する必要がないので省施工となる。なお、建材ユニット１２５を用いることによって、住居および非住居において、１階と２階や隣室や室内と室外との換気にも利用できる。
【０２７８】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２７９】
このように本発明の参考例３４の送風装置によれば、壁体と送風装置が一体化することにより、省施工となり、換気方式を多様化することができる。
【０２８０】
（参考例３５）
つぎに本発明の参考例３５について図１および図４９を参照しながら説明する。なお、参考例１および参考例１７から参考例３４の同一箇所には同一番号を付けて詳細な説明は省略する。
【０２８１】
図に示すように、断面がベルマウス形状または略台形状を有する吸込オリフィス１２６と、回転手段を有した本体取付金具１１２と上流から下流に向かって空気の通過断面積が小さくなる吹き出しルーバ１２７を備え、送風方向に１個ないし複数個設置した構成にされている。
【０２８２】
上記構成において、送風機本体１の電動機により軸流羽根車が回転し、送風機本体１の吹き出し側に上流から下流つまり吹き出し方向に向かって、空気の吹き出し断面積を小さくすることで通過風速が大きくなるようにした吹き出しルーバ１２７で空気の搬送距離を大きく取れるようにし、さらに送風機本体１の周辺の汚れた空気や搬送されてきた空気を確実に捕集するための吸込オリフィス１２６を送風機本体１の吸込側に備えて、軸流羽根車の回転軸を含む断面の形状をベルマウス形状または略台形状としている。そこで送風機本体１を送風したい方向に１個ないし複数個設置することによりダクト設備がない状態でも換気送風が可能となり、低コスト、省施工の送風装置を実現することができる。また送風機本体１の本体取付金具１１２が回転可能であるために送風方向を変えたい場合に送風機本体１を反転することで可能である。なお、この送風装置は主にダクトを設置しにくい天井高の高い工場や、逆に天井高が低く、梁の多いダクトを設置しにくい環境、例えば地下駐車場に利用できる。
【０２８３】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２８４】
このように本発明の参考例３５の送風装置によれば、ダクト設備なしで換気送風が可能な低コスト、省施工の送風装置を実現することができる。
【０２８５】
（参考例３６）
つぎに本発明の参考例３６について図１および図５０を参照しながら説明する。なお、参考例１および参考例１７から参考例３５の同一箇所には同一番号を付けて詳細な説明は省略する。
【０２８６】
図に示すように、上流または下流のダクト９６中間部または端部に空気清浄フィルタ１２８を配設した構成にされている。
【０２８７】
上記構成において、送風機本体１の電動機により軸流羽根車が回転し、送風機本体１により給気を行う際、送風機本体１の上流あるいは下流のダクト９６中間部または端部に空気清浄フィルタ１２８を配設することにより室外からの空気に含まれる塵やごみ、花粉、ウィルスが室内に侵入することを防ぐことができる。また室内の汚れた空気を換気する際にも、そこで換気の概念を室内から環境に広げて考え、送風機本体１の上流あるいは下流のダクト９６中間部または端部に空気清浄フィルタ１２８を配設することにより、直接汚れた空気を排出しなくて済むために環境汚染も防ぐことができる。なお、この送風装置は主にきれいな空気の環境が要求されるクリーンルームや、病院、居室、非居室に用いることができる。
【０２８８】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２８９】
このように本発明の参考例３６の送風装置によれば、空気清浄フィルタ１２８を配設することにより室外からの空気に含まれる塵やごみ、花粉、ウィルスが室内に侵入することを防ぐことが可能な送風装置を実現することができる。
【０２９０】
（参考例３７）
つぎに本発明の参考例３７について図１および図５１を参照しながら説明する。なお、参考例１および参考例１７から参考例３６の同一箇所には同一番号を付けて詳細な説明は省略する。
【０２９１】
図に示すように、上流または下流のダクト９６中間部または端部に消臭ユニット１２９を配設した構成にされている。
【０２９２】
上記構成において、室内の汚れた空気を直接室外に排出するということは従来あたりまえのようにされてきたが、密集した住宅やマンションで排出される臭い、油煙の問題で排気の位置方向が限られてきている。そこで換気の概念を室内から環境に広げて考え、室外に室内の汚れた空気を排気する際にも、送風機本体１の上流あるいは下流のダクト９６中間部または端部に消臭ユニット１２９を配設することにより、直接汚れた空気を排出せず消臭して排気するために、排気の位置方向に制約を受けず自由に設計することができ、環境汚染も防ぐことができる。なお、送風機本体１の電動機により軸流羽根車が回転し、送風機本体１により給気を行う際、送風機本体１の上流あるいは下流のダクト９６中間部または端部に消臭ユニット１２９を配設することにより室外からの空気に含まれるいやな臭いが室内に侵入することを防ぐことができる。
【０２９３】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２９４】
このように本発明の参考例３７の送風装置によれば、消臭ユニット１２９を配設することにより、排気時において消臭して排気するために、排気の位置方向に制約を受けず、環境汚染も防ぐことが可能な送風装置を実現することができる。
【０２９５】
（参考例３８）
つぎに本発明の参考例３８について図１および図５２を参照しながら説明する。なお、参考例１および参考例１７から参考例３７の同一箇所には同一番号を付けて詳細な説明は省略する。
【０２９６】
図に示すように、上流または下流のダクト９６中間部または端部に消音ユニット１３０を配設した構成にされている。
【０２９７】
上記構成において、送風機本体１の電動機により軸流羽根車が回転し、送風機本体１により排気および給気を行う際、送風機本体１の上流あるいは下流のダクト９６中間部または端部に消音ユニット１３０を配設することにより室外からの騒音の侵入することを防ぐことができる。なお、送風装置は主に騒音の大きい環境に立地するビル、住宅に用いられる。
【０２９８】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０２９９】
このように本発明の参考例３８の送風装置によれば、消音ユニット１３０を配設することにより室外からの騒音の侵入を防ぐことが可能な送風装置を実現することができる。
【０３００】
（参考例３９）
つぎに本発明の参考例３９について図１および図５３を参照しながら説明する。なお、参考例１および参考例１７から参考例３８の同一箇所には同一番号を付けて詳細な説明は省略する。
【０３０１】
図に示すように、一方の側面の上下または、一方の側面の上方と対向または隣接する他方の側面の下方に給排用の開口部１２２を有し、この上方と下方の開口部１２２間の一方の側面に点検口１２３を有した細長の箱体状の柱用建材ユニット１３１の内部に配設した構成にされている。
【０３０２】
上記構成において、送風機本体１の電動機により軸流羽根車が回転し、柱用建材ユニット１３１の内部を空気が流れ、冬期の暖房時には上方の開口部１２２を吸込口とし、下方の開口部１２２を吹き出し口とすることで、室内の暖まった上方の空気を下方に移動し、室内の空気を循環させることつまりサーキュレーションすることで温度のムラをなくすことができる。これにより、空調機器の省エネ運転が可能となりランニングコストを低減でき、快適な空調ができる。また夏期の冷房時には送風機本体を反転して設置することにより、冬期と同じ効果が得られる。なお、送風装置は主に天井高の高い空気が循環しにくい居室、ホール、ロビー、階段、吹き抜けで用いることができる。
【０３０３】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０３０４】
このように本発明の参考例３９の送風装置によれば、送風機本体１を細長の箱体状の柱用建材ユニット１３１の内部に配設することにより、室内の空気を循環させることで室内の温度のムラをなくすことができ、空調機器の省エネ運転が可能で快適な空調ができる。
【０３０５】
（参考例４０）
つぎに本発明の参考例４０について図１および図５４を参照しながら説明する。なお、参考例１および参考例１７から参考例３９の同一箇所には同一番号を付けて詳細な説明は省略する。
【０３０６】
図に示すように、略円筒状または箱体状の送風機本体１の支持枠体１３２とこの支持枠体１３２内に挿脱可能な略円筒状または箱体状の挿脱アダプタ１３３を備え、この挿脱アダプタ１３３内に固着した構成にされている。
【０３０７】
上記構成において、天井懐のない居室の壁に開口部１２２を設けた際に、ダクト９６端部に送風機本体１を略円筒状または箱体状の送風機本体１の支持枠体１３２とこの支持枠体１３２内に挿脱可能な略円筒状または箱体状の挿脱アダプタ１３３を設けることにより、挿脱アダプタ１３３内に固着した送風機本体１が容易に挿脱アダプタ１３３と同時に取り出すことが可能で、送風機本体１のメンテナンスが非常に簡単になり、省メンテナンスの送風装置が実現できるとともに開口部１２２のグリル１３４を小さくできるため美観も損なわない送風装置が実現できる。なお、天井懐のない居室の壁を建物の外壁としても良く、さらに開口部１２２は吸込口あるいは吹き出し口のどちらでも良い。
【０３０８】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０３０９】
このように本発明の参考例４０の送風装置によれば、送風機本体１に支持枠体１３２と挿脱アダプタ１３３を設け、挿脱アダプタ１３３内に固着することにより、送風機本体１が容易に挿脱アダプタ１３３と同時に取り出すことが可能になり、省メンテナンスの送風装置が実現できる。
【０３１０】
（参考例４１）
つぎに本発明の参考例４１について図１および図５５を参照しながら説明する。なお、参考例１および参考例１７から参考例４０の同一箇所には同一番号を付けて詳細な説明は省略する。
【０３１１】
図に示すように、天井面の一部に点検用の開口部１２２および開閉扉１３５を有し、この開閉扉１３５の天井裏側に、ダクト９６との位置合わせの調節手段を有する固定金具１３６を用いて固定され、かつダクト９６に脱着可能な手段および形状を有する接続アダプタ１３７を備えた構成にされている。
【０３１２】
上記構成において、送風機本体１を設置する際に天井面の一部に必ず点検用の開口部１２２および開閉扉１３５を要する。そこで開閉扉１３５を利用して、開閉扉１３５の天井裏側にダクト９６との位置合わせの調節手段を有する固定金具１３６を用いて送風機本体１を固定し、さらにダクト９６に脱着可能な手段および形状を有する接続アダプタ１３７を備えることで、開閉扉１３５を開閉すると同時に送風機本体１もダクト９６と脱着することが可能となり、送風機本体１の組み込みが容易になり省施工になるとともに、点検時においても開閉扉１３５を開くと同時に送風機本体１もダクト９６から離れ、開閉扉１３５に固定されながら送風装置が天井面より下に下ろすことができ、開閉扉１３５を閉めると同時に送風機本体１もダクト９６に接続されるためメンテナンスも容易になる。
【０３１３】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０３１４】
このように本発明の参考例４１の送風装置によれば、開閉扉１３５を開閉すると同時に送風機本体１もダクト９６と脱着することが可能となり、送風機本体１の組み込み、点検が容易になり、省施工、省メンテナンスの送風装置が実現できる。
【０３１５】
（参考例４２）
つぎに本発明の参考例４２について図１および図５６を参照しながら説明する。なお、参考例１および参考例１７から参考例４１の同一箇所には同一番号を付けて詳細な説明は省略する。
【０３１６】
図に示すように、室内と室外を連通するダクト９６の室外側端部に細長の開口部１２２を有する給排ユニット１３８または一面に開口部１２２を有する箱体状の給排ボックス１３９を備え、ダクト９６の中間部ないし端部に配設した構成にされている。
【０３１７】
上記構成において、建物の屋根の軒下に給排ユニット１３８または給排ボックス１３９を設置することにより、室外側より雨の浸入を防ぐことができるとともに、目立たない位置にあるため美観も損なわない送風装置が実現できる。
【０３１８】
なお、参考例１から２１記載のいずれか、あるいは請求項１から８記載のいずれかの送風機を用いれば、小型化が可能となり、送風装置としての諸性能（静圧、風量、効率、騒音）は更に向上する。
【０３１９】
このように本発明の参考例４２の送風装置によれば、建物の屋根の軒下に給排ユニット１３８または給排ボックス１３９を設置することにより、室外側より雨の浸入を防ぐことができる送風装置が実現できる。
【０３２０】
【発明の効果】
以上のように実施例から明らかなように、本発明によれば、小型で高静圧、大風量を得ることができる軸流羽根車の騒音を低減でき、サージング現象の発生を高静圧側へ移行すると共に範囲を最小限でき、軸流羽根車の設計手法を確立した騒音の低い送風機を提供できる。
【０３２１】
また、軸流羽根車を通過後の、旋回成分をもち、２次流れや逆流により乱れた流れを効率的に回収し流体損失を低減し、結果的に消費電力を低減できる送風機を提供できる。
【０３２２】
また、小型で高静圧、大風量を得ることができる騒音の低い軸流羽根車の送風機を用いることで、従来の換気送風機器および空気調和機器では成し得なかった幅広い、用途の展開を行うことができる。
【図面の簡単な説明】
【図１】 本発明の参考例１の送風機の側断面図
【図２】 同要部正面図
【図３】 同要部断面図
【図４】 同要部正面図
【図５】 同要部側断面図
【図６】 同要部側断面図
【図７】 同要部正面図
【図８】 同実施例６の要部正面図
【図９】 同参考例２の要部側断面図
【図１０】 同要部側断面図
【図１１】 同要部側断面図
【図１２】 同実施例７の要部側断面図
【図１３】 同参考例１１の要部正面図
【図１４】 同要部正面図
【図１５】 同参考例１２の要部正面図
【図１６】 同要部断面図
【図１７】 同参考例１３の要部正面図
【図１８】 同参考例１４の要部側断面図
【図１９】 同参考例１５の要部側断面図
【図２０】 同参考例１６の要部側断面図
【図２１】 同要部断面図
【図２２】 同参考例１の外周前進角Ａθｔにおける比騒音レベルＫｓの性能特性図
【図２３】 同実施例１の反り率差における比騒音レベルＫｓの性能特性図
【図２４】 同実施例３の取付角差における比騒音レベルＫｓの性能特性図
【図２５】 同実施例６の２弦節比Ｓにおける比騒音レベルＫｓの性能特性図
【図２６】 同実施例８の反り率差における比騒音レベルＫｓの性能特性図
【図２７】 同参考例５の取付角差における比騒音レベルＫｓの性能特性図
【図２８】 同参考例８の弦節比Ｓにおける比騒音レベルＫｓの性能特性図
【図２９】 同参考例１７および１８の側断面図
【図３０】 （ａ）同参考例１７の送風機の動翼，静翼の外周側周方向断面図
（ｂ）同内周側周方向断面図
（ｃ）同動翼の回転による気流の速度線図
【図３１】 （ａ）同参考例１８の送風機の動翼，静翼の外周側周方向断面図
（ｂ）同内周側周方向断面図
【図３２】 同参考例１９の側断面図
【図３３】 同要部断面図
【図３４】 同参考例２０の側断面図
【図３５】 同参考例２１の側断面図
【図３６】 同参考例２２の側面図
【図３７】 同参考例２３の側面図
【図３８】 （ａ）同参考例２４の側面図
（ｂ）同側面図
（ｃ）同収納・梱包時側面図
【図３９】 同参考例２５の正断面図
【図４０】 同参考例２６の断面図
【図４１】 同参考例２７の断面図
【図４２】 同参考例２８の断面図
【図４３】 同参考例２９の断面図
【図４４】 （ａ）同参考例３０の夏期使用時の側面図
（ｂ）同冬期使用時の側面図
（ｃ）同平面図
【図４５】 （ａ）同参考例３１の斜視図
（ｂ）同側面図
【図４６】 （ａ）同参考例３２の斜視図
（ｂ）同側面図
【図４７】 （ａ）同参考例３３の斜視図
（ｂ）同側面図
【図４８】 （ａ）同参考例３４の斜視図
（ｂ）同斜視図
（ｃ）同側面図
【図４９】 同参考例３５の側面図
【図５０】 同参考例３６の平面図
【図５１】 （ａ）同参考例３７の側断面図
（ｂ）同側断面図
【図５２】 同参考例３８の側断面図
【図５３】 同参考例３９の斜視図
【図５４】 （ａ）同参考例４０の側断面図
（ｂ）同側面図
【図５５】 （ａ）同参考例４１の斜視図
（ｂ）同側面図
【図５６】 （ａ）同参考例４２の斜視図
（ｂ）同側面図
【図５７】 従来の送風機の側面図
【図５８】 同要部正面図
【図５９】 同要部正面図
【図６０】 同要部断面図
【図６１】 同要部正面図
【図６２】 同要部側断面図
【図６３】 同要部正断面図
【図６４】 同側断面図
【図６５】 同要部断面図
【符号の説明】
１ 送風機本体
２ 軸流羽根車
３ 電動機
４ 回転軸
５ ハブ
６ 翼
Ｏ 原点
Ｄｔ 羽根径
ＫＤｈ 仮想ハブ径
７ 前縁部
８ 後縁部
ＫＡｈ 仮想ハブ円弧
Ｋｈ 仮想ハブ円弧中心点
Ｘ 直線
ＤＤ 直径
ＬＲ 翼弦投影線
ＰＲ 翼弦投影中心点
Ａθ 前進角
９ 翼内周部投影線
Ｐｔ 翼外周部投影中心点
Ａθｔ 外周前進角
１０ 回転方向
１１ 外周部
１２ 内周部
Ｄｈ ハブ径
１３ 翼断面
１４ 中心線
Ｌ 翼弦長
Ｄ 反り
Ｑｔ 外周部反り率
Ｃθ 取付角
Ｃθｔ 外周部取付角
Ｔ ピッチ
１５ 負圧面
１６ 正圧面
１７ 二次流れ
１８ 吸込側
１９ 吐出側
２０ 逆流
２１ 斜流羽根車
２２ リング
２３ 翼弦
２４ 翼列線
２５ 流れ
２６ 頂点
２７ 曲線
２８ 外周縁
２９ 内周縁
３０ 流路
３１ ケーシング
３２ 流れ
３３ 主流
３４ 流れ
３５ 半径方向翼断面
Ｂｈ 点
Ｊ 基準面
Ｂｋ 点
Ｆｖ 法線成分
Ｖ 円筒面
Ｒｆ 交点
Ｕ 平面
β１ 入口角
３６ 流れ
３７ 補助翼
３８ 外周側
３９ 内周側
４０ リング
４１ 植毛材
４２ 隙間
４３ 逆流
４４ 凹部
４５ 凸部
Ｄ１ 吸込側直径
Ｄ２ 吐出側直径
４６ 極大点
４７ 前縁側
４８ 後縁側
４９ 極小点
５０ 流れ
６１ 枠体
６２ 脚部
６３ 電動機ケース
６４ 電動機
６５ 回転軸端部
６６ 軸流羽根車
６７ 送風機
６８ 軸方向端部
６９ 外周縁
７０ 内周縁
７１ 静翼
７２ｔ 入口部
７２ｈ 入口部
７３ｔ 肉厚部
７３ｈ 肉厚部
７４ｔ 入口部
７４ｈ 入口部
７５ｔ 肉厚部
７５ｈ 肉厚部
Ｈ 静翼の高さ
７６ 前端
７７ 後端
７８ 外周側入口部
７９ 補助静翼
βｓ 入口角度
βｓ’ 入口角度
８０ 薄肉リング
８１ 前端
８２ 羽毛状突起物
９１ 排気口
９２ フード本体
９３ フィルタ
９４ 吸込オリフィス
９５ 吸込口
９６ ダクト
９７ フード本体
９９ 本体取付金具
ｄ 孔径
１００ フィルタ
１０１ 本体
１０２ｉ 開口部
１０２ｏ 開口部
１０３ フィルタ
１０４ 本体
１０５ｉ 開口部
１０５ｏ 開口部
１０６ フィルタ
１０７ 超高性能フィルタ
１０８ 照明機器
１１１ 吸込オリフィス
１１２ 本体取付金具
１１３ 風向フィン
１１４ 線状吹き出し拡散ルーバ
１１５ 吹き出し口
１１６ ガイド
１１７ 環状吹き出し拡散ルーバ
１１８ 風向フィン
１１９ 回転拡散ルーバ
１２１ 側壁
１２２ 開口部
１２３ 点検口
１２４ 点検扉
１２５ 壁用建材ユニット
１２６ 吸込オリフィス
１２７ 吹き出しルーバ
１２８ 空気清浄フィルタ
１２９ 消臭ユニット
１３０ 消音ユニット
１３１ 柱用建材ユニット
１３２ 支持枠体
１３３ 挿脱アダプタ
１３５ 開閉扉
１３６ 固定金具
１３７ 接続アダプタ
１３８ 給排ユニット
１３９ 給排ボックス
２０１ 送風機本体
２０２ 軸流羽根車
２０４ 回転軸
２０５ ハブ
２０６ 翼
２０８ 後縁部
２１０ 回転方向
２１１ 外周部
２１２ 内周部
２１３ 翼断面
２１４ 中心線
２１５ 負圧面
２１６ 正圧面
２１７ 二次流れ
２１８ 吸込側
２１９ 吐出側
２２０ 逆流
２３０ 流路
２３１ ケーシング
２３２ 流れ
２３３ 主流
２３４ 流れ
２５２ 流路渦
２５５ 遠心羽根車
２５６ 流体
２５７ 箱体
２５８ 渦巻ケーシング
Ｏ’ 原点
Ｐｈ’ 翼内周部投影中心点
Ｘ’ 直線
ＤＤ’ 直径
ＬＲ’ 翼弦投影線
ＰＲ’ 翼弦投影中心点
Ａθ’ 前進角
Ａθｔ’ 外周前進角
Ｃθ’ 取付角
Ｌ’ 翼弦長
Ｄ’ 反り
２６０ 静翼
２６１ 外周縁
２６２ 内周縁
２６３ｔ 入口部
２６３ｈ 入口部
２６４ 枠体[0001]
BACKGROUND OF THE INVENTION
The present invention makes it possible to reduce noise generated particularly at high static pressure in a blower used for a ventilation blower and an air conditioner, and to widen the use range of an axial flow impeller. It relates to a blower.
[0002]
[Prior art]
In recent years, blowers used in ventilation and air-conditioning equipment used in residential and non-residential spaces have been used as ventilation and air-conditioning equipment with a low air pressure and a high air volume that do not require much static pressure. Until now, low-noise axial-flow impellers have been designed by various design methods. However, downsizing of equipment, expansion of the range of use of equipment performance, and further development of a wide range of applications are further demanded, and ventilation fans and air conditioning equipment with high static pressure and high air volume that require static pressure are required. However, the conventional blowers have a problem that the noise rapidly increases at a high static pressure. Conventionally, centrifugal blowers have been used as high static pressure blowers that require static pressure. However, the capacity of the equipment is large, the amount of air is small, and it has not been possible to meet all social needs. Therefore, a fan with low noise during operation, a small size, a wide range of use in performance, and a wide range of uses is required, and a design method for an axial-flow impeller used for the fan and development of the fan are required.
[0003]
Conventionally, this type of blower generally has the configuration shown in FIGS. 57 to 65. The configuration will be described below with reference to the drawings. As shown in the figure, by using a centrifugal impeller 255 for the blower body 201 and enclosing the entire spiral casing 258 provided with the centrifugal impeller 255 with a box body 257, the fluid 256 is blown in the axial flow direction, The shape of the blade 206 when the flow impeller 202 is used is the same as the shape of the blade 206 in the projection that is projected on a plane perpendicular to the rotation shaft 204 when the axial flow impeller 202 is projected in the axial direction of the rotation shaft 204. A point that divides the projection line of the inner peripheral portion 212 of the axial flow impeller 202 into two equal parts is defined as an origin O ′, and a blade inner peripheral projection center point Ph ′ is defined as the origin O ′ and the blade inner peripheral projection center point Ph ′. The chord projection center point PR ′ and the origin O that bisect the chord projection line LR ′ of the wing 206 cut by a cylindrical surface having an arbitrary diameter DD ′ centered on the straight line X ′ and the origin O ′. When the angle between the straight line passing through 'and the straight line X' is the forward angle Aθ ', the wing 20 The angle formed by the straight line X ′ and the straight line connecting the blade outer peripheral projection central point Pt ′ and the origin O ′, which divides the projection line of the outer peripheral portion 211 into two, is the rotational advance angle Aθt ′. The radial blade section 235 of the blade 206 cut along a plane including the rotating shaft 204 with a positive direction of 210 is 50 ° or less is a flat or substantially arc shape with a large curvature close to the flat, and the shaft A free vortex that makes the work from the inner peripheral portion 212 to the outer peripheral portion 211 of the blade 206 of the flow impeller 202 constant, and a forcing to make the mounting angle Cθ ′ from the inner peripheral portion 212 to the outer peripheral portion 211 of the blade 206 substantially constant. The center line 214 of the blade section 213 of the blade 206 designed by a flow distribution called a vortex and cut by a cylindrical surface having an arbitrary diameter DD ′ centered on the origin O ′ is substantially arc-shaped and has a chord length L of the blade section 213. The warp rate Q 'is' and warp D 'is Q' = D ′ / L ′, the warp rate Q ′ of the inner peripheral portion 212 is larger than the outer peripheral portion 211, and the mounting angle Cθ ′ of the inner peripheral portion 212 is larger than the outer peripheral portion 211, or , The mounting angle Cθ ′ is substantially constant from the inner peripheral portion 212 to the outer peripheral portion 211, and when the axial flow impeller 202 is projected in the axial direction of the rotary shaft 204, the projection is projected on a plane perpendicular to the rotary shaft 204. In the drawing, adjacent wings 206 and wings 206 are configured not to overlap each other.
[0004]
Further, when the axial-flow impeller 202 is used in the duct, the stationary blade 260 is often installed on the downstream side, and has a thin wall and a constant curvature. The length of the outer peripheral edge 261 of the stationary blade 260 is long. In general, the length is longer than the length of the inner peripheral edge 262, that is, the outer peripheral side entrance angle is larger than the inner peripheral side entrance angle.
[0005]
In the above configuration, a very high static pressure is required to reduce the size of the device and expand the range of use of the device performance. Need to rotate.
[0006]
As a result, the amount of work per blade 206 also increases, and the generation of vortices becomes significant due to the development of the boundary layer of the suction surface 215 of the blade 206. Further, in an arbitrary blade cross section 213 of the blade 206 cut by a cylindrical surface having an arbitrary diameter DD ′ centered on the origin O ′, the blade 206 has an outer peripheral advance angle Aθt ′ indicating a degree of advance in the rotation direction 210. The difference in rotational position of any blade cross section 213 from the inner peripheral portion 212 to the outer peripheral portion 211 is small. When the mass is m, the radius of rotation is r, and the angular velocity is ω, the centrifugal force f is f = m · r · ω. 2 As the rotational speed increases, only the angular velocity ω increases. Therefore, a large centrifugal force acts in the direction of the arrow F ′ at a high rotation speed than at a low rotation speed. Due to this large centrifugal force, a secondary flow 217 is induced from the inner peripheral portion 212 toward the outer peripheral portion 211 in the boundary layer of the suction surface 215 of the blade 206, and low-energy fluid accumulates in the vicinity of the outer peripheral portion 211. Therefore, disturbance occurs near the outer peripheral portion 211 of the suction surface 215, and noise increases.
[0007]
Further, the secondary flow 217 promotes the generation of the backflow 220 in the vicinity of the suction side 218 of the outer peripheral portion 211 of the blade 206 specific to the axial flow fan, and causes a surging phenomenon. In the surging region, the flow field of the blades 206 of the axial flow impeller 202 becomes unstable and fluctuates, and the rotation of the axial flow impeller 202 also becomes unstable, resulting in a sudden increase in noise and a decrease in fan efficiency.
[0008]
Further, the radial blade cross section 235 of the blade 206 cut by a plane including the rotating shaft 204 is flat or substantially arc-shaped with a large curvature near the flat, and the adjacent blade 206 and blade 206 of the axial flow impeller 202 are Since the flow 232 in the vicinity of the boundary layer between the hub 205 and the casing 231 is smaller than the main flow 233 and the centrifugal force due to the warp of the blades 206 is also small, the flow from the pressure surface 216 of the blades 206 is negative. A flow 234 toward the pressure surface 215 is generated to form a pair of flow path vortices 252. In the vicinity of the rear edge portion 208, the flow path vortex 252 of the adjacent flow path 230 comes into contact, and an accompanying vortex is generated.
[0009]
Further, the shape of the blade cross section 213 in the radial direction of the blade 206 of the axial impeller 202 is designed with a flow distribution of free vortex or forced vortex, and the mounting angle of the inner peripheral portion 212 is larger than the outer peripheral portion 211 or is attached. The corner is substantially constant from the inner peripheral portion 212 to the outer peripheral portion 211. Accordingly, a pressure gradient is generated from the outer peripheral portion 211 to the inner peripheral portion 212 when the axial flow impeller 202 is operated. Further, in order to obtain a small size and high static pressure and a large air volume, a large centrifugal force is exerted by increasing the rotational speed of the axial impeller 202, and the inner peripheral portion 212 is changed to the outer peripheral portion 211 in the boundary layer of the suction surface 215 of the blade 206. A strong secondary flow 217 is induced. However, the design of the blade 206 (warping rate Q ′, mounting angle Cθ ′) that balances the secondary flow 217 and the pressure gradient due to the work of the blade 206 of the axial flow impeller 202 is not made, and the flow is disturbed. Resulting noise increases.
[0010]
Further, when the blades 206 of the axial flow impeller 202 are viewed from the axial direction, a configuration in which the adjacent blades 206 and the blades 206 do not overlap each other is common. In the axial flow impeller 202 having such a gap between the blade 206 and the blade 206, the pressure difference between the suction side 218 and the discharge side 219 of the axial flow impeller 202 becomes large at high static pressure, and along the blade 206. Since it becomes difficult to flow, the boundary layer becomes large, which causes an increase in noise.
[0011]
In addition, the flow that has passed through the axial flow impeller 202 becomes a mixed flow that expands in the radial direction due to the centrifugal force at the time of high static pressure and high rotation, and therefore, particularly at the inlet portion 263t on the outer peripheral side of the stationary blade 260. The main flow until it interferes with the secondary flow that rebounds on the inner peripheral surface of the frame 264 and does not become a flow having a constant inflow angle, but induces a large vortex and flows in a turbulent state, thus affecting the separation. And fluid loss is large. Further, at the inlet 263h on the inner peripheral side of the stationary blade 260, the backflow phenomenon is confirmed by a visualization experiment or the like, and the main flow does not become a flow having a constant inflow angle due to the influence of the backflow, but flows in a turbulent state. By doing so, the fluid loss is large. Therefore, the improvement of the total pressure efficiency by installing the stationary blade 260, that is, the reduction of the power consumption cannot be expected.
[0012]
In the case of the blower main body 201 using the centrifugal impeller 255 suitable for high static pressure, the volume of the box body 257 of the blower main body 201 for blowing the fluid 256 in the axial flow direction is reduced, and the high static pressure is used. It is very difficult to obtain a large air volume, and when the spiral casing 258 is exposed without using the box body 257, the path of the fluid 256 bends at right angles between suction and blowing, It was difficult to develop applications only by using the centrifugal impeller 255.
[0013]
[Problems to be solved by the invention]
In such a conventional blower, the noise increase due to the high rotation of the axial flow impeller when obtaining a small, high static pressure and large air volume is very large, and the surging phenomenon peculiar to the axial flow impeller at high static pressure There is a problem that the noise due to the occurrence of noise increases rapidly, reducing the noise of a small impeller that can obtain high static pressure and large air volume, minimizing the occurrence of surging phenomenon, and low noise shaft It is required to establish a design method for the flow impeller.
[0014]
Moreover, there exists a subject that power consumption will increase if it tries to obtain high static pressure with a small size, and it is requested | required to increase the total pressure efficiency of an air blower and to reduce power consumption.
[0015]
In addition, there is a problem with the development of new applications using a low-noise axial-flow impeller that is small and capable of obtaining high static pressure and large air volume, and it is required to show the development of various applications. .
[0016]
The present invention solves the conventional problems, can reduce the noise of an axial-flow impeller that is small and can obtain a high static pressure and a large air volume, and minimizes the occurrence of a surging phenomenon unique to an axial-flow fan. It is an object of the present invention to provide a blower having an axial-flow impeller that can be used in a limited range and can be used in a wide range, and has established its design technique.
[0017]
[Means for Solving the Problems]
This To achieve the purpose of of First means Is shown below .
[0018]
The blower of the present invention is this First to achieve the purpose 1 In the arbitrary blade cross section cut by the plane including the rotational axis of the axial flow impeller, the means of A curve connecting a plurality of vertices in an arbitrary blade section passes from the intersection of the leading edge of the blade or the leading edge of the blade to the outer periphery to the intersection of the trailing edge or the trailing edge and the inner periphery. Having an axial flow impeller, Further, an intersection between the inner peripheral portion and the rear edge portion of the blade of the axial flow impeller is defined as a point Bh, a surface passing through the point Bh and orthogonal to the rotation axis is defined as a reference plane J, and the rear edge portion and the outer peripheral portion are When the intersection point is a point Bk, the blower has the axial flow impeller in which the vertex and the point Bk are all located closer to the suction side than the reference plane J.
[0019]
In order to achieve the object, the second means is the second means. 1's The blade section is formed by cutting the blade with a cylindrical surface of an arbitrary diameter DD centered on the rotational axis of the axial flow impeller and developing the section in a two-dimensional manner. The warp rate Q is given by Q = D / L with the chord length L and warpage D of the blade cross section, and the outer peripheral warpage rate Qt in the blade cross section of the outer peripheral portion is arbitrary on the inner peripheral side from the outer peripheral portion. The blower has the axial flow impeller that takes a value larger than the warp rate Q.
[0020]
In order to achieve the object, the third means is the first means. 1's The blade section is formed by cutting the blade with a cylindrical surface of an arbitrary diameter DD centered on the rotational axis of the axial flow impeller and developing the section in a two-dimensional manner. The warp rate Q is given by Q = D / L with the chord length L and the warp D of the blade cross section, and the outer peripheral warp rate Qt in the blade cross section of the outer peripheral portion is arbitrary on the inner peripheral side from the outer peripheral portion. The axial flow that takes a value larger than the warp rate Q, and the difference between the outer peripheral warp rate Qt and the inner peripheral warp rate Qh in the blade cross section of the inner peripheral portion of the blade is 0.001 or more and 0.020 or less. A blower having an impeller is provided.
[0021]
In order to achieve the above purpose, 4 Means of said 1's The blade section is formed by cutting the blade with a cylindrical surface of an arbitrary diameter DD centered on the rotation axis of the axial flow impeller, and developing the section in two dimensions. The blade chord is perpendicular to the rotation axis. An angle formed with a blade row line that is a straight line passing through the leading edge of the blade is defined as a mounting angle Cθ, and the outer peripheral mounting angle Cθt in the blade cross section of the outer peripheral portion is an arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion. It is set as the air blower which has the said axial flow impeller which takes a larger value.
[0022]
Further, in order to achieve the object, the fifth means includes the first 1's The blade section is formed by cutting the blade with a cylindrical surface of an arbitrary diameter DD centered on the rotation axis of the axial flow impeller, and developing the section in two dimensions. The blade chord is perpendicular to the rotation axis. An angle formed with a blade row line that is a straight line passing through the leading edge of the blade is defined as a mounting angle Cθ, and the outer peripheral mounting angle Cθt in the blade cross section of the outer peripheral portion is an arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion. The axial flow impeller has a larger value, and the difference between the outer peripheral mounting angle Cθt and the inner peripheral mounting angle Cθh in the blade cross section of the inner peripheral portion of the blade is 0.1 ° to 6 °. It is a blower.
[0023]
In order to achieve the object, a sixth means is the first means. 1's The blade section is formed by cutting the blade with a cylindrical surface of an arbitrary diameter DD centered on the rotational axis of the axial flow impeller and developing the section in a two-dimensional manner. The warp rate Q is given by Q = D / L with the chord length L and warpage D of the blade cross section, and the outer peripheral warpage rate Qt in the blade cross section of the outer peripheral portion is arbitrary on the inner peripheral side from the outer peripheral portion. The angle between the blade chord in the blade cross section and the blade row line that is perpendicular to the rotation axis and passes through the leading edge of the blade is set as the mounting angle Cθ. The blower has the axial flow impeller in which the outer peripheral attachment angle Cθt in the blade cross section of the outer peripheral portion takes a larger value than the arbitrary attachment angle Cθ on the inner peripheral side from the outer peripheral portion.
[0024]
Further, in order to achieve the object, a seventh means includes the first 1's The blade section is formed by cutting the blade with a cylindrical surface of an arbitrary diameter DD centered on the rotational axis of the axial flow impeller and developing the section in a two-dimensional manner. The warp rate Q is given by Q = D / L with the chord length L and warpage D of the blade cross section, and the outer peripheral warpage rate Qt in the blade cross section of the outer peripheral portion is arbitrary on the inner peripheral side from the outer peripheral portion. The warp rate Q is greater than the difference between the outer peripheral warp rate Qt and the inner peripheral warp rate Qh in the blade section of the inner peripheral portion of the blade is 0.001 or more and 0.020 or less. An angle formed between a chord in the blade cross section and a blade row line that is perpendicular to the rotation axis and passes through the leading edge of the blade is a mounting angle Cθ, and the outer peripheral portion of the outer peripheral portion in the blade cross section is attached. The angle Cθt takes a value larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion, and the outer peripheral portion The difference between the inner peripheral portion mounting angle Cθh in blade section of the inner peripheral portion of the blade and the biasing angle Cθt is obtained by a blower having the axial flow impeller falls below 6 ° 0.1 °.
[0025]
In order to achieve the above purpose, 8 Means of the first, second, third, fourth, fifth, 6 Or 7 The chord length L in the blade section of an arbitrary diameter DD of the axial flow impeller and the blade leading edge portion which is a straight line passing through the leading edge portion of the blade perpendicular to the rotation axis and passing through the leading edge portion of the blade. When the pitch T is the distance between the wing and the leading edge of the wing adjacent to the wing, the chord ratio S is given by S = L / T, and the chord ratio S is 1.1 or more and 1.9 or less. It becomes a blower having the axial flow impeller.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is the above-described first. 1's Depending on the configuration of the means, the radial shape of the blades of the axial flow impeller is a convex shape inclined on the fluid suction side, and the level of these factors is optimized, and the axial flow impeller is designed based on this. Therefore, it is possible to reduce the noise of an axial-flow impeller that is small and can obtain a high static pressure and a large air volume, minimize the occurrence of a surging phenomenon unique to an axial-flow fan, and widen the range of use. Can do.
[0027]
The second 2, 3, 4, 5, 6, 7 Or first 8 The radial shape of the blade of the axial-flow impeller is a convex shape that is inclined toward the fluid suction side, and the shape of the blade in the circumferential direction is warped from the inner peripheral portion of the blade to the outer peripheral portion. A shape with a larger ratio, with a mounting angle at the outer peripheral part larger than the inner peripheral part of the blade, and adjacent blades overlap each other, optimizing the level of these factors, and based on this, the axial flow impeller Because of the design, it is possible to reduce the noise of the axial-flow impeller that is small and can obtain high static pressure and large air volume, minimize the occurrence of surging phenomenon peculiar to the axial-flow fan, and use range Can be wide.
[0028]
【Example】
( reference Example 1)
Hereinafter, the present invention reference Example 1 will be described with reference to FIGS. 1 to 7 and FIG.
[0029]
As shown in the figure, when the axial flow impeller 2 is projected in the axial direction of the rotary shaft 4 of the axial flow impeller 2 that is locked to the electric motor 3 of the blower body 1, it is projected on a plane perpendicular to the rotary shaft 4. In the projection view, the rotation axis 4 is the origin O, the diameter 0.4082 times the blade diameter Dt of the axial flow impeller 2 is the virtual hub diameter KDh, and the virtual hub diameter KDh is the front of the blade 6 of the axial flow impeller 2. A point that bisects the virtual hub arc KAh formed by dividing the edge 7 and the rear edge 8 is defined as a virtual hub arc center point Kh, and a straight line passing through the origin O and the virtual hub arc center point Kh is a straight line X, the origin The angle formed by the straight line X and the straight line passing through the origin O and the chord projection center point PR that bisects the chord projection line LR of the blade 6 that is cut by a cylindrical surface of an arbitrary diameter DD centered on O is the advance angle. When Aθ, the blade outer periphery projection center point Pt that bisects the blade inner periphery projection line 9 of the blade 6 and the origin O The angle formed by the connecting line and the straight line X, that is, the outer peripheral advance angle Aθt is 55 ° or more and 180 ° or less with the rotational direction 10 of the axial flow impeller 2 as the positive direction. Is smaller than the outer peripheral advance angle Aθt, and the hub diameter Dh of the hub 5 of the axial flow impeller 2 having the blade diameter Dt is in the range of 0 <Dh ≦ Dt · (1-32.549 / Aθt). And a blade section 13 formed by cutting the blade 6 with a cylindrical surface of an arbitrary diameter DD centered on the rotating shaft 4 of the axial flow impeller 2 and developing the section two-dimensionally. The center line 14 is substantially arc-shaped, the bow chord length L and the warp D of the blade cross section 13 is given by the warp rate Q as Q = D / L, and the outer peripheral warp rate Qt of the outer cross section 11 of the blade cross section 13 is A structure having an axial-flow impeller 2 having a value larger than an arbitrary warp rate Q on the inner peripheral side from the outer peripheral portion 11. It has been in.
[0030]
With the above configuration, a very high static pressure is required to reduce the size of the device and expand the range of use of the device performance. In order to obtain a small size, a high static pressure, and a large air volume, the casing 31 of the blower body 1 is engaged. The axial-flow impeller 2 needs to be rotated at a high speed by the motor 3 that is stopped. When the mass is m, the radius of rotation is r, and the angular velocity is ω, the centrifugal force f is f = m · r · ω. 2 Given in. As the rotational speed increases, only the angular velocity ω increases, so that a larger centrifugal force acts in the direction of arrow F at a high rotation than at a low rotation. Due to this large centrifugal force, a secondary flow 17 is induced from the inner peripheral portion 12 toward the outer peripheral portion 11 in the boundary layer of the suction surface 15 of the blade 6. However, since the blades 6 of the axial flow impeller 2 have a shape that is greatly advanced in the rotation direction 10, the secondary flow 17 can be discharged from the trailing edge portion 8, thereby preventing accumulation of low-energy fluid at the outer peripheral portion 11. , Noise can be reduced.
[0031]
Further, since the front edge portion 7 of the blade 6 has a shape that is greatly advanced in the rotation direction 10, the outer peripheral portion 11 of the front edge portion 7 is not affected by the secondary flow 17 on the inner peripheral side. It is difficult for the backflow 20 to occur near the suction side 18 of the portion 11. Therefore, since the rotation unique to the axial flow fan becomes unstable, the surging phenomenon that the noise increases rapidly and the fan efficiency is reduced, and it can move to the high static pressure side, the use area of the axial flow impeller 2 can be increased. .
[0032]
Further, the hub diameter Dh and the blade diameter Dt of the axial flow impeller 2 are particularly effective in reducing noise within the range of 0 <Dh ≦ Dt · (1-32.549 / Aθt). It is possible to design the low-noise axial-flow impeller 2 corresponding to the change in height.
[0033]
Further, the center line 14 in the blade cross section 13 of the blade 6 has a substantially arc shape, and the warp rate Q is given by Q = D / L when the chord length L and the warp D of the blade cross section 13 is Q = D / L. Is larger than an arbitrary warp rate Q on the inner peripheral side of the outer peripheral portion 11, and therefore the work amount of the outer peripheral portion 11 is larger than that of the inner peripheral portion 12 of the blade 6, and pressure is applied from the outer peripheral portion 11 to the inner peripheral portion 12. A gradient occurs. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced.
[0034]
Here, the specific noise level Ks (dB (A)) is expressed as Ks = SPL-10 · Log ((Ps + Pv) 2 • Define as Q).
[0035]
SPL: Noise level Q: Air volume Ps: Static pressure Pv: Dynamic pressure As shown in FIG. 22, the outer peripheral advance angle Aθt with the rotational direction 10 of the axial flow impeller 2 as the positive direction is 55 ° or more and 180 ° or less. It can be seen that the noise level Ks is small. Further, the outer peripheral advance angle Aθt becomes the minimum specific noise level Ks around 105 °.
[0036]
Thus, the present invention reference According to the blower of Example 1, the hub diameter Dh of the axial flow impeller 2 and the blade diameter Dt of the axial flow impeller 2 are in the range of 0 <Dh ≦ Dt · (1-32.549 / Aθt), and the blade 6 Is designed so that the outer peripheral advancing angle Aθt is 55 ° or more and 180 ° or less and the outer peripheral warpage rate Qt is larger than the arbitrary warpage rate Q on the inner peripheral side from the outer peripheral portion 11. Suppression of noise increase due to high rotation of the axial flow impeller 2 when obtaining the air volume, and unstable rotation due to the unstable rotation of the axial flow fan, resulting in low fan efficiency and less prone to surging phenomenon Since it can move to the high static pressure side, the use area of the axial flow impeller 2 can be increased, and the noise of the blower main body 1 with a small size, high static pressure, and large air volume can be reduced.
[0037]
In addition, reference In Example 1, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are the average values of the suction side 18 and the discharge side 19. Since the same effect can be obtained, the mixed flow impeller 21 may be used as the impeller.
[0038]
Further, by providing a substantially cylindrical ring 22 on the outer peripheral portion 11 of the axial flow impeller 2, it is possible to prevent the blade 6 from being deformed or broken when the axial flow impeller 2 is rotated. The shape of the axial-flow impeller 2 and the blades 6 for improving the strength to prevent deformation or destruction of the blades 6 is not limited to this.
[0039]
(Example 1 )
Next, an embodiment of the present invention 1 Will be described with reference to FIGS. 1 to 7 and FIG. In addition, reference The same parts as those in Example 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0040]
As shown in the figure reference The blade section 13 is obtained by cutting the blade 6 with a cylindrical surface having an arbitrary diameter DD centered on the rotation shaft 4 of the axial flow impeller 2 in the configuration of Example 1 and developing the section in two dimensions. 13 has a substantially circular arc shape, the chord length L and the warp D of the blade cross section 13 and the warp rate Q is given by Q = D / L, and the outer peripheral warp rate Qt of the outer cross section 11 of the blade cross section 13 is It takes a value larger than an arbitrary warp rate Q on the inner peripheral side from the outer peripheral part 11, and the difference between the outer peripheral warp rate Qt and the inner peripheral part warp rate Qh in the blade cross section 13 of the inner peripheral part 12 of the blade 6 is 0.001. The axial flow impeller 2 is 0.020 or less.
[0041]
With the above configuration, the radial distribution of the warp rate Q, which is one of the important factors determining the work amount of the blades 6 of the axial flow impeller 2, is expressed here as the outer peripheral warp rate Qt and the inner peripheral warp rate Qb. The difference in the warpage rate is optimized, and the outer peripheral advancing angle Aθt is set to an optimum level of 105 °, and the outer peripheral warpage rate Qt is larger than the arbitrary warpage rate Q on the inner peripheral side from the outer peripheral portion 11. It was done in. Due to the shape of the blade 6, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6, and a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced. Therefore, by further balancing the pressure gradient from the outer peripheral part 11 to the inner peripheral part 12 and the balance of the secondary flow 17 from the inner peripheral part 12 to the outer peripheral part 11, the warp rate difference can be optimized. Noise can be reduced. As shown in FIG. 23, it is understood that the specific noise level Ks is small when the warp rate difference is 0.001 or more and 0.020 or less. Further, the difference in warp rate becomes the minimum specific noise level Ks around 0.008.
[0042]
Thus, the embodiment of the present invention 1 According to this blower, the difference between the outer peripheral warpage rate Qt of the axial flow impeller 2 and the inner peripheral warpage rate Qh in the blade cross section 13 of the inner peripheral portion 12 of the blade 6 is in the range of 0.001 to 0.020. By designing with the above, it is possible to suppress an increase in noise due to high rotation of the axial flow impeller 2 when obtaining a small, high static pressure and large air volume, and a small, high static pressure, large air volume blower body 1 The noise can be lowered.
[0043]
Examples 1 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0044]
(Example 2 )
Next, an embodiment of the present invention 2 Will be described with reference to FIGS. 1 to 7 and FIG. In addition, reference The same parts as those in Example 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0045]
As shown in the figure, when the axial flow impeller 2 is projected in the axial direction of the rotary shaft 4 of the axial flow impeller 2 that is locked to the electric motor 3 of the blower body 1, it is projected on a plane perpendicular to the rotary shaft 4. In the projection view, the rotation axis 4 is the origin O, the diameter 0.4082 times the blade diameter Dt of the axial flow impeller 2 is the virtual hub diameter KDh, and the virtual hub diameter KDh is the front of the blade 6 of the axial flow impeller 2. A point that bisects the virtual hub arc KAh that can be divided by the edge 7 and the rear edge 8 is defined as a virtual hub arc center point Kh, and a straight line passing through the origin O and the virtual hub arc center point Kh is a straight line X and the origin O The angle between the chord projection center point PR that bisects the chord projection line LR of the wing 6 that is cut by a cylindrical surface having an arbitrary diameter DD centered on the axis and the straight line passing through the origin O and the straight line X is a forward angle. When Aθ, the blade outer peripheral projection center point Pt that divides the blade outer peripheral projection line 9 of the blade 6 into two equal parts and the origin The angle between the straight line connecting the straight line X and the straight line X, that is, the outer peripheral advance angle Aθt is 55 ° or more and 180 ° or less with the rotational direction 10 of the axial flow impeller 2 as the positive direction. Aθ is smaller than the outer peripheral advance angle Aθt, and the hub diameter Dh of the hub 5 of the axial flow impeller 2 having the blade diameter Dt is in the range of 0 <Dh ≦ Dt (1-32.549 / Aθt). And a blade cross section 13 formed by cutting the blade 6 with a cylindrical surface of an arbitrary diameter DD centered on the rotation shaft 4 of the axial flow impeller 2 and developing the cross section two-dimensionally. The angle formed by the blade line 24 that is perpendicular to the rotating shaft 4 and passes through the leading edge 7 of the blade 6 is the mounting angle Cθ, and the outer peripheral mounting angle Cθt in the blade cross section 13 of the outer peripheral portion 11 is the outer peripheral portion. 11 has an axial flow impeller 2 that takes a value larger than an arbitrary mounting angle Cθ on the inner peripheral side. .
[0046]
With the above configuration, a very high static pressure is required to reduce the size of the device and expand the range of use of the device performance. In order to obtain a small size, a high static pressure, and a large air volume, the motor 3 of the blower main body 1 is pivoted. It is necessary to rotate the flow impeller 2 at a high speed. When the mass is m, the radius of rotation is r, and the angular velocity is ω, the centrifugal force f is f = m · r · ω. 2 Given in. As the rotational speed increases, only the angular velocity ω increases, so that a larger centrifugal force acts in the direction of arrow F at a high rotation than at a low rotation. Due to this large centrifugal force, a secondary flow 17 is induced from the inner peripheral portion 12 toward the outer peripheral portion 11 in the boundary layer of the suction surface 15 of the blade 6. However, since the blades 6 of the axial flow impeller 2 have a shape that is greatly advanced in the rotation direction 10, the secondary flow 17 can be discharged from the trailing edge portion 8, thereby preventing accumulation of low-energy fluid at the outer peripheral portion 11. , Noise can be reduced.
[0047]
Further, since the front edge portion 7 of the blade 6 has a shape that is greatly advanced in the rotation direction 10, the outer peripheral portion 11 of the front edge portion 7 is not affected by the secondary flow 17 on the inner peripheral side. It is difficult for the backflow 20 to occur near the suction side 18 of the portion 11. Therefore, since the rotation unique to the axial flow fan becomes unstable, the surging phenomenon that the noise increases rapidly and the fan efficiency is reduced, and it can move to the high static pressure side, the use area of the axial flow impeller 2 can be increased. .
[0048]
Further, the hub diameter Dh and the blade diameter Dt of the axial flow impeller 2 are particularly effective in reducing noise within the range of 0 <Dh ≦ Dt · (1-32.549 / Aθt). It is possible to design the low-noise axial-flow impeller 2 corresponding to the change in height.
[0049]
Further, since the outer peripheral mounting angle Cθt in the blade cross section 13 of the outer peripheral portion 11 is larger than the arbitrary mounting angle Cθ on the inner peripheral side of the outer peripheral portion 11, the outer peripheral portion 11 is more than the inner peripheral portion 12 of the blade 6. Therefore, a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced.
[0050]
Here, the specific noise level Ks (dB (A)) is expressed as Ks = SPL-10 · Log ((Ps + Pv) 2 • Define as Q).
[0051]
SPL: Noise level Q: Air volume Ps: Static pressure Pv: Dynamic pressure As shown in the diagram, the outer peripheral advancing angle Aθt with the rotational direction 10 of the axial flow impeller 2 as the positive direction is 55 ° to 180 ° and the specific noise It can be seen that the level Ks is small. Further, the outer peripheral advance angle Aθt becomes the minimum specific noise level Ks around 105 °.
[0052]
Thus, the embodiment of the present invention 2 According to the blower, the hub diameter Dh of the axial flow impeller 2 and the blade diameter Dt of the axial flow impeller 2 are in the range of 0 <Dh ≦ Dt · (1-32.549 / Aθt), and the outer circumference of the blade 6 When the advancing angle Aθt is 55 ° or more and 180 ° or less, and the outer peripheral mounting angle Cθt is designed to be larger than the arbitrary mounting angle Cθ on the inner peripheral side of the outer peripheral portion 11, it is possible to obtain a small size with high static pressure and large air volume. The high static pressure side reduces the noise increase caused by the higher rotation of the axial impeller 2 and the surging phenomenon that the rotation specific to the axial flow fan becomes unstable and the noise increases sharply and the fan efficiency decreases. Therefore, the usage area of the axial flow impeller 2 can be increased, and the noise of the blower main body 1 having a small size, high static pressure, and large air volume can be reduced.
[0053]
Examples 2 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0054]
Further, by providing a substantially cylindrical ring 22 on the outer peripheral portion 11 of the axial flow impeller 2, it is possible to prevent the blade 6 from being deformed or broken when the axial flow impeller 2 is rotated. The shape of the axial-flow impeller 2 and the blades 6 for improving the strength to prevent deformation or destruction of the blades 6 is not limited to this.
[0055]
(Example 3 )
Next, an embodiment of the present invention 3 Will be described with reference to FIGS. 1 to 7 and FIG. Examples 2 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0056]
As shown in the figure, the blade of the configuration of the third embodiment can be obtained by cutting the blade 6 with a cylindrical surface having an arbitrary diameter DD centered on the rotating shaft 4 of the axial flow impeller 2 and developing the cross section in two dimensions. In section 13, the angle formed between chord 23 and blade row 24, which is a straight line passing through leading edge 7 of blade 6 and perpendicular to rotation axis 4, is set as attachment angle Cθ, and outer periphery of blade 11 in outer blade section 13. The part mounting angle Cθt takes a value larger than an arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral part 11, and the outer peripheral part mounting angle Cθt and the inner peripheral part mounting angle Cθh in the blade cross section 13 of the inner peripheral part 12 of the blade 6 The axial flow impeller 2 has a difference of 0.1 ° to 6 °.
[0057]
With the above configuration, the radial distribution of the mounting angle Cθ, which is one of the important factors that determine the work amount of the blades 6 of the axial-flow impeller 2, is expressed here as the outer peripheral mounting angle Cθt and the inner peripheral mounting angle Cθb. The angle of outer periphery advancing angle Aθt is an optimum value of 105 °, and the outer peripheral mounting angle Cθt is larger than an arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion 11. It was done in. Due to the shape of the blade 6, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6, and a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced. Therefore, the mounting angle difference can be optimized by balancing the pressure gradient from the outer peripheral portion 11 to the inner peripheral portion 12 and the balance of the secondary flow 17 from the inner peripheral portion 12 to the outer peripheral portion 11. Noise can be reduced. As shown in FIG. 24, it is understood that the specific noise level Ks is small when the mounting angle difference is 0.1 ° or more and 6 ° or less. Further, the mounting angle difference becomes the minimum specific noise level Ks around 2 °.
[0058]
Thus, the embodiment of the present invention 3 According to this blower, the difference between the outer peripheral mounting angle Cθt of the axial impeller 2 and the inner peripheral mounting angle Cθh in the blade cross section 13 of the inner peripheral portion 12 of the blade 6 is in the range of 0.1 ° to 6 °. By designing with the above, it is possible to suppress an increase in noise due to high rotation of the axial flow impeller 2 when obtaining a small, high static pressure and large air volume, and a small, high static pressure, large air volume blower body 1 The noise can be lowered.
[0059]
Examples 3 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0060]
(Example 4 )
Next, an embodiment of the present invention 4 Will be described with reference to FIGS. In addition, reference Example 1 and Examples 2 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0061]
As shown in the figure reference Example 1 and Examples 2 The blade section 13 is formed by cutting the blade 6 with a cylindrical surface of an arbitrary diameter DD centered on the rotation shaft 4 of the axial flow impeller 2 and developing the section two-dimensionally. The center line 14 is substantially arc-shaped, the bow chord length L and the warp D of the blade cross section 13 is given by the warp rate Q as Q = D / L, and the outer peripheral warp rate Qt of the outer cross section 11 of the blade cross section 13 is Cascade which takes a value larger than an arbitrary warp rate Q on the inner peripheral side from the outer peripheral portion 11 and is a straight line passing through the leading edge portion 7 of the blade 6 perpendicular to the chord 23 and the rotating shaft 4 in the blade cross section 13. An axial flow impeller 2 in which an angle formed with the line 24 is a mounting angle Cθ, and an outer peripheral mounting angle Cθt in the blade cross section 13 of the outer peripheral portion 11 is larger than an arbitrary mounting angle Cθ on the inner peripheral side of the outer peripheral portion 11. It has the composition which has.
[0062]
With the above configuration, the center line 14 in the blade cross section 13 of the blade 6 has a substantially arc shape, and when the blade chord length L and the warp D of the blade cross section 13 and the warpage rate Q is given by Q = D / L, the outer periphery warp. The rate Qt is a value larger than the arbitrary warp rate Q on the inner peripheral side 12 from the outer peripheral portion 11, and the outer peripheral mounting angle Cθt in the blade cross section 13 of the outer peripheral portion 11 is arbitrary mounting on the inner peripheral side from the outer peripheral portion 11. Since the value is larger than the angle Cθ, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6, and a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced.
[0063]
Thus, the embodiment of the present invention 4 According to this blower, the outer peripheral warpage rate Qt is larger than the arbitrary warpage rate Q on the inner peripheral side from the outer peripheral portion 11, and the outer peripheral portion mounting angle Cθt is larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion 11. By designing with values, it is possible to suppress the increase in noise due to high rotation of the axial flow impeller 2 when obtaining a small, high static pressure and large air volume, and the rotation specific to the axial flow fan becomes unstable and noise It is difficult to generate a surging phenomenon in which the fan efficiency rapidly decreases and the fan efficiency decreases, and the use area of the axial flow impeller 2 can be increased because it can move to the high static pressure side, and the small fan body 1 with high static pressure and large air volume can be used. Noise can be reduced.
[0064]
Examples 4 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0065]
(Example 5 )
Next, an embodiment of the present invention 5 Will be described with reference to FIGS. Examples 1 And examples 3 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0066]
As shown in the figure, the example 1 And examples 3 In this configuration, the difference between the outer peripheral portion warpage rate Qt and the inner peripheral portion warpage rate Qb is 0.001 or more and 0.020 or less, and the difference between the outer peripheral portion attachment angle Cθt and the inner peripheral portion attachment angle Cθb is 0.1. The axial flow impeller 2 has a configuration in which the angle is not less than 6 ° and not more than 6 °.
[0067]
With the above configuration, the radial distribution of the warpage rate Q and the mounting angle Cθ, which are important factors for determining the work amount of the blade 6 of the axial flow impeller 2, here, the outer peripheral warpage rate Qt and the inner peripheral warpage rate Qb. And the difference between the outer peripheral mounting angle Cθt and the inner peripheral mounting angle Cθb, optimization is performed using an optimal level of 105 ° for the outer peripheral advance angle Aθt, and the outer peripheral warpage rate Qt is set to the outer peripheral portion 11. The value was larger than the arbitrary warp rate Q on the inner peripheral side 12 and the outer peripheral mounting angle Cθt was larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion 11. Due to the shape of the blade 6, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6, and a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced. Therefore, by adjusting the balance between the pressure gradient from the outer peripheral portion 11 to the inner peripheral portion 12 and the secondary flow 17 from the inner peripheral portion 12 to the outer peripheral portion 11, the warp rate difference and the mounting angle difference can be optimized. The noise of the impeller 2 can be reduced. As shown in the figure, it is understood that the specific noise level Ks is small when the warp rate difference is 0.001 or more and 0.020 or less. Further, the difference in warp rate becomes the minimum specific noise level Ks around 0.008. Further, as shown in the figure, it is understood that the specific noise level Ks is small when the mounting angle difference is not less than 0.1 ° and not more than 6 °. Further, the mounting angle difference becomes the minimum specific noise level Ks around 2 °.
[0068]
Thus, the embodiment of the present invention 5 According to this blower, the difference between the outer peripheral warpage rate Qt and the inner peripheral warpage rate Qb of the axial flow impeller 2 is 0.001 or more and 0.020 or less, and the outer peripheral warpage rate Qt is on the inner peripheral side from the outer peripheral portion 11. The difference between the outer peripheral mounting angle Cθt and the inner peripheral mounting angle Cθb of the axial flow impeller 2 is 0.1 ° to 6 ° and the outer peripheral mounting angle Cθt is the outer peripheral portion 11. By designing with a value larger than an arbitrary mounting angle Cθ on the inner peripheral side, it is possible to suppress an increase in noise due to a high rotation speed of the axial impeller 2 when obtaining a small, high static pressure and large air volume. The noise of the blower main body 1 with a small size, high static pressure, and large air volume can be reduced.
[0069]
Examples 5 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0070]
(Example 6 )
Next, an embodiment of the present invention 6 Will be described with reference to FIGS. 1 to 8 and FIG. In addition, Reference Example 1, Example 1 to Example 5 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0071]
As shown in the figure Reference Example 1, 1st, 2nd, 3rd, 4 And examples 5 In the configuration, the chord length L in the blade cross section 13 of an arbitrary diameter DD of the axial flow impeller 2 and the blade line 24 which is a straight line passing through the leading edge 7 of the blade 6 perpendicular to the rotating shaft 4, When the pitch T is the distance between the leading edge 7 of the blade 6 and the leading edge 7 of the blade 6 adjacent to the blade 6, the chord ratio S is given by S = L / T, and the chord ratio S is 1 The axial flow impeller 2 is set to be in the range of 1 to 1.9.
[0072]
With the above configuration, when the chord length L does not change, the distance 25 between the blades 6, that is, the pitch T is decreased, that is, the number of the blades 6 is increased, so that the flow 25 can easily follow the blades 6 even at high static pressure. The noise can be reduced by reducing the thickness of the plate. However, if the pitch T is extremely reduced, that is, if the number of blades 6 is increased too much, the number of sound sources of noise generated from each blade 6 is equal to the number of blades 6. Cause rise. Therefore, the optimization of the chordal ratio S given by S = L / T is carried out with the outer peripheral advance angle Aθt being 105 ° and the outer peripheral warpage rate Qt being larger than the arbitrary warp rate Q on the inner peripheral side from the outer peripheral portion 11. The difference between the part warp rate Qt and the inner part warp rate Qb is 0.008, the outer peripheral part mounting angle Cθt is larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral part 11, and the outer peripheral part mounting angle Cθt and the inner peripheral part. The difference from the part mounting angle Cθb was made using an optimum level of 2 °. As shown in FIG. 25, it can be seen that the chordal ratio S is 1.1 or more and 1.9 or less and the specific noise level Ks is small. Further, the chordal ratio S becomes a minimum specific noise level Ks around 1.5.
[0073]
Thus, the embodiment of the present invention 6 According to the blower, the chordal ratio S of the blades 6 of the axial flow impeller 2 is designed in the range of 1.1 or more and 1.9 or less, so that the shaft is small when obtaining a high static pressure and a large air volume. An increase in noise due to high rotation of the flow impeller 2 can be suppressed, and the noise of a small, high static pressure, large air volume blower can be reduced.
[0074]
Examples 5 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0075]
( reference Example 2 )
Next, the present invention reference Example 2 Will be described with reference to FIGS. Examples 5 ~Example 6 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0076]
As shown in the figure, in an arbitrary blade cross section 13 cut by a plane including the rotating shaft 4 of the axial flow impeller 2, a point located closest to the suction side 18 is a vertex 26, and a plurality of blade cross sections 13 in the arbitrary blade cross section 13 are arranged. An axis through which a curve 27 connecting the vertices 26 passes from the intersection of the leading edge 7 of the wing 6 or the leading edge 7 thereof to the outer periphery 11 to the intersection of the trailing edge 8 or the trailing edge 8 and the inner periphery 12. The flow impeller 2 is configured.
[0077]
With the above configuration, the flow of the flow path 30 between the adjacent blades 6 is such that the flow 32 near the boundary layer between the hub 5 and the casing 31 is smaller than the main flow 33 and the centrifugal force due to the warp D of the blades 6 is also small. Therefore, a flow 34 from the pressure surface 16 of the blade 6 toward the suction surface 15 is generated by the pressure gradient. However, it is optional to be cut at a plane including the rotating shaft 4 that does not include the intersection between the front edge portion 7 and the outer peripheral portion 11 of the blade 6 of the axial flow impeller 2 and the intersection between the rear edge portion 8 and the inner peripheral portion 12. In the blade cross section 13, the apex 26 located closest to the suction side 18 has a convex shape on the suction surface 15 side that does not exist on the outer peripheral edge 28 or the inner peripheral edge 29 of the blade cross section 13. It is stopped by the outer peripheral edge 28 or the inner peripheral edge 29, and the formation of a pair of flow path vortices can be prevented. Further, since the flow path vortex is difficult to be formed, the formation of the accompanying vortex can be prevented, and the noise can be reduced.
[0078]
Thus, the present invention reference Example 2 According to the blower, in the arbitrary blade cross section 13 cut by the plane including the rotation shaft 4 of the axial flow impeller 2, the point located on the most suction side 18 is the vertex 26, and a plurality of blade cross sections 13 in the arbitrary blade cross section 13 are arranged. A curve 27 connecting the vertices 26 passes from the front edge 7 of the wing 6 or the intersection of the front edge 7 and the outer periphery 11 to the intersection of the rear edge 8 or the rear edge 8 and the inner periphery 12. Therefore, it is possible to suppress an increase in noise due to the high rotation of the axial flow impeller 2 when obtaining a small, high static pressure and large air volume, and to reduce the noise of a small, high static pressure, large air volume blower. Can be lowered.
[0079]
In addition, reference Example 2 Then, although the impeller of the blower is the axial flow impeller 2, the same effect can be obtained by the mixed flow impeller 21.
[0080]
Further, by providing a substantially cylindrical ring 22 on the outer peripheral portion 11 of the axial flow impeller 2, it is possible to prevent the blade 6 from being deformed or broken when the axial flow impeller 2 is rotated. The shape of the axial-flow impeller 2 and the blades 6 for improving the strength to prevent deformation or destruction of the blades 6 is not limited to this.
[0081]
(Example 7 )
Next, an embodiment of the present invention 7 Will be described with reference to FIGS. In addition, Reference examples 1, 2, Example 1 to Example 6 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0082]
As shown in the figure reference Example 2 In an arbitrary blade cross section 13 cut along a plane including the rotating shaft 4 of the axial flow impeller 2, the point located closest to the suction side 18 is a vertex 26, and the blade 6 of the axial flow impeller 2 is An intersection point between the inner peripheral portion 12 and the rear edge portion 8 is defined as a point Bh, a surface passing through the point Bh and orthogonal to the rotation axis 4 is defined as a reference plane J, and an intersection point between the rear edge portion 8 and the outer peripheral portion 11 is defined as a point Bk. In this case, the apex 26 and the point Bk are configured to have the axial flow impeller 2 that is located on the suction side 18 from the reference plane J.
[0083]
With the above configuration, the axial flow impeller 2 rotates and centrifugal force works in the direction of arrow F, and the normal component Fv of the suction surface 15 of centrifugal force works by tilting the blade 6 forward to the suction side 18. The thickness of the boundary layer on the suction surface 15 of the blade 6 can be suppressed, and noise can be reduced.
[0084]
Thus, the embodiment of the present invention 7 According to this blower, by making the blade 6 tilt forward to the suction side 18, it is possible to suppress an increase in noise due to high rotation of the axial-flow impeller 2 when obtaining a small, high static pressure and large air volume. It is possible to reduce the noise of a small, high static pressure, large air volume blower.
[0085]
Examples 7 Then, although the impeller of the blower is the axial flow impeller 2, the same effect can be obtained by the mixed flow impeller 21.
[0086]
( reference Example 3 )
Next, the present invention reference Example 3 Will be described with reference to FIGS. In addition, reference Example 2 And examples 7 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0087]
As shown in the figure reference Example 2 And examples 7 9, the blade section 13 is formed by cutting the blade 6 with a cylindrical surface having an arbitrary diameter DD centered on the rotating shaft 4 of the axial flow impeller 2 and developing the section in a two-dimensional manner. The center line 14 in FIG. 13 has a substantially arc shape, the bow chord length L of the blade cross section 13 and the warp D, the warp rate Q is given by Q = D / L, and the outer peripheral warp rate Qt in the blade cross section 13 of the outer peripheral portion 11 is The axial flow impeller 2 has a value larger than an arbitrary warp rate Q on the inner peripheral side from the outer peripheral portion 11.
[0088]
With the above configuration, as shown in the figure, the center line 14 in the blade cross section 13 of the blade 6 has a substantially arc shape, the chord length L and the warp D of the blade cross section 13, and the warpage rate Q is given by Q = D / L. When the outer peripheral portion warpage rate Qt is larger than the arbitrary warpage rate Q on the inner peripheral side from the outer peripheral portion 11, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6. A pressure gradient is generated from the portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced.
[0089]
Thus, the present invention reference Example 3 According to this blower, the axial flow impeller at the time of obtaining a small and high static pressure and a large air volume by designing the outer peripheral portion warpage rate Qt to be larger than the arbitrary warpage rate Q on the inner peripheral side from the outer peripheral portion 11. 2) Suppression of noise increase due to high rotation and unstable rotation due to unstable rotation of the axial blower, resulting in a sudden increase in noise and reduced fan efficiency. The use area of the axial flow impeller 2 can be increased, and the noise of the blower main body 1 having a small size, a high static pressure, and a large air volume can be reduced.
[0090]
In addition, reference Example 3 Then, although the impeller of the blower is the axial flow impeller 2, the same effect can be obtained by the mixed flow impeller 21.
[0091]
(Example 8 )
Next, an embodiment of the present invention 8 Will be described with reference to FIGS. 1 to 12 and FIG. In addition, reference Example 2, 3, Example 7 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0092]
As shown in the figure reference Example 2 And examples 7 The blade section 13 is formed by cutting the blade 6 with a cylindrical surface of an arbitrary diameter DD centered on the rotation shaft 4 of the axial flow impeller 2 and developing the section two-dimensionally. The center line at is substantially arc-shaped, the chord length L and the warp D of the blade cross section 13 is given by a warp rate Q of Q = D / L, and the outer peripheral warp rate Qt of the outer cross section 11 of the blade cross section 13 is It takes a value larger than an arbitrary warp rate Q on the inner peripheral side from the portion 11, and the difference between the outer peripheral warp rate Qt and the inner peripheral warp rate Qh in the blade cross section 13 of the inner peripheral portion 12 of the blade 6 is 0.001 or more. It is set as the structure which has the axial-flow impeller 2 used as 0.020 or less.
[0093]
With the above configuration, the radial distribution of the warp rate Q, which is one of the important factors determining the work amount of the blades 6 of the axial flow impeller 2, is expressed here as the outer peripheral warp rate Qt and the inner peripheral warp rate Qb. Therefore, optimization of the warp rate difference was performed with the outer peripheral portion warp rate Qt being larger than the arbitrary warp rate Q on the inner peripheral side of the outer peripheral portion 11. Due to the shape of the blade 6, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6, and a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced. Therefore, by further balancing the pressure gradient from the outer peripheral part 11 to the inner peripheral part 12 and the balance of the secondary flow 17 from the inner peripheral part 12 to the outer peripheral part 11, the warp rate difference can be optimized. Noise can be reduced. As shown in FIG. 26, it is understood that the specific noise level Ks is small when the warp rate difference is 0.001 or more and 0.020 or less. Further, the difference in warp rate becomes the minimum specific noise level Ks around 0.008.
[0094]
Thus, the embodiment of the present invention 8 According to this blower, the difference between the outer peripheral warpage rate Qt of the axial flow impeller 2 and the inner peripheral warpage rate Qh in the blade cross section 13 of the inner peripheral portion 12 of the blade 6 is in the range of 0.001 to 0.020. By designing with the above, it is possible to suppress an increase in noise due to high rotation of the axial flow impeller 2 when obtaining a small, high static pressure and large air volume, and a small, high static pressure, large air volume blower body 1 The noise can be lowered.
[0095]
Examples 8 Then, although the impeller of the blower is the axial flow impeller 2, the same effect can be obtained by the mixed flow impeller 21.
[0096]
( reference Example 4 )
Next, the present invention reference Example 4 Will be described with reference to FIGS. In addition, reference Example 2 And examples 7 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0097]
As shown in the figure reference Example 2 And examples 7 The blade section 13 is formed by cutting the blade 6 with a cylindrical surface of an arbitrary diameter DD centered on the rotation shaft 4 of the axial flow impeller 2 and developing the section two-dimensionally. The angle formed by the blade line 24 that is perpendicular to the rotating shaft 4 and passes through the leading edge 7 of the blade 6 is the mounting angle Cθ, and the outer peripheral mounting angle Cθt in the blade cross section 13 of the outer peripheral portion 11 is the outer peripheral portion. 11 has an axial impeller 2 having a value larger than an arbitrary mounting angle Cθ on the inner peripheral side.
[0098]
With the above configuration, the outer peripheral mounting angle Cθt in the blade cross section 13 of the outer peripheral portion 11 is the outer peripheral portion 11.
Since the value is larger than an arbitrary attachment angle Cθ on the inner peripheral side, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6, and a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced.
[0099]
Thus, the present invention reference Example 4 According to this blower, the outer peripheral mounting angle Cθt is designed to have a larger value than the arbitrary mounting angle Cθ on the inner peripheral side of the outer peripheral portion 11, so that the axial flow impeller when obtaining a small, high static pressure and large air volume is provided. The increase in noise due to the higher rotation of 2 can be suppressed, and the noise of the blower main body 1 having a small size, high static pressure, and large air volume can be reduced.
[0100]
In addition, reference Example 4 Then, although the impeller of the blower is the axial flow impeller 2, the same effect can be obtained by the mixed flow impeller 21.
[0101]
( reference Example 5 )
Next, the present invention reference Example 5 Will be described with reference to FIGS. In addition, reference Example 2 ,Example 7 and reference Example 4 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0102]
As shown in the figure reference Example 2 And examples 7 The blade section 13 is formed by cutting the blade 6 with a cylindrical surface of an arbitrary diameter DD centered on the rotation shaft 4 of the axial flow impeller 2 and developing the section two-dimensionally. The angle formed with the blade line 24, which is perpendicular to the rotating shaft 4 and passes through the leading edge 7 of the blade 6, is the mounting angle Cθ. 11 is larger than an arbitrary mounting angle Cθ on the inner peripheral side, and the difference between the outer peripheral mounting angle Cθt and the inner peripheral mounting angle Cθh in the blade cross section 13 of the inner peripheral portion 12 of the blade 6 is 0.1 ° or more. The axial flow impeller 2 is 6 ° or less.
[0103]
With the above configuration, the radial distribution of the mounting angle Cθ, which is one of the important factors that determine the work amount of the blades 6 of the axial-flow impeller 2, is expressed here as the outer peripheral mounting angle Cθt and the inner peripheral mounting angle Cθb. The angle of outer periphery advancing angle Aθt is an optimum value of 105 °, and the outer peripheral mounting angle Cθt is larger than an arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion 11. It was done in. Due to the shape of the blade 6, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6, and a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced. Therefore, the mounting angle difference can be optimized by balancing the pressure gradient from the outer peripheral portion 11 to the inner peripheral portion 12 and the balance of the secondary flow 17 from the inner peripheral portion 12 to the outer peripheral portion 11. Noise can be reduced. As shown in FIG. 27, it is understood that the specific noise level Ks is small when the mounting angle difference is 0.1 ° or more and 6 ° or less. Further, the mounting angle difference becomes the minimum specific noise level Ks around 2 °.
[0104]
Thus, the present invention reference Example 5 According to this blower, the difference between the outer peripheral mounting angle Cθt of the axial impeller 2 and the inner peripheral mounting angle Cθh in the blade cross section 13 of the inner peripheral portion 12 of the blade 6 is in the range of 0.1 ° to 6 °. By designing with the above, it is possible to suppress an increase in noise due to high rotation of the axial flow impeller 2 when obtaining a small, high static pressure and large air volume, and a small, high static pressure, large air volume blower body 1 The noise can be lowered.
[0105]
In addition, reference Example 5 Then, although the impeller of the blower is the axial flow impeller 2, the same effect can be obtained by the mixed flow impeller 21.
[0106]
( reference Example 6 )
Next, the present invention reference Example 6 Will be described with reference to FIGS. In addition, reference Example 2 And examples 7 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0107]
As shown in the figure reference Example 2 And examples 7 The blade section 13 is formed by cutting the blade 6 with a cylindrical surface of an arbitrary diameter DD centered on the rotation shaft 4 of the axial flow impeller 2 and developing the section two-dimensionally. The center line 14 is substantially arc-shaped, the bow chord length L and the warp D of the blade cross section 13 is given by the warp rate Q as Q = D / L, and the outer peripheral warp rate Qt of the outer cross section 11 of the blade cross section 13 is Cascade which takes a value larger than an arbitrary warp rate Q on the inner peripheral side from the outer peripheral portion 11 and is a straight line passing through the leading edge portion 7 of the blade 6 perpendicular to the chord 23 and the rotating shaft 4 in the blade cross section 13. An axial flow impeller 2 in which an angle formed with the line 24 is a mounting angle Cθ, and an outer peripheral mounting angle Cθt in the blade cross section 13 of the outer peripheral portion 11 is larger than an arbitrary mounting angle Cθ on the inner peripheral side of the outer peripheral portion 11. It has the composition which has.
[0108]
With the above configuration, the center line 14 in the blade cross section 13 of the blade 6 has a substantially arc shape, and when the blade chord length L and the warp D of the blade cross section 13 and the warpage rate Q is given by Q = D / L, the outer periphery warp. The rate Qt is a value larger than an arbitrary warp rate Q on the inner peripheral side from the outer peripheral part 11, and the outer peripheral part mounting angle Cθt in the blade cross section 13 of the outer peripheral part 11 is an arbitrary mounting angle on the inner peripheral side from the outer peripheral part 11. Since the value is larger than Cθ, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6, and a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced.
[0109]
Thus, the present invention reference Example 6 According to this blower, the outer peripheral warpage rate Qt is larger than the arbitrary warpage rate Q on the inner peripheral side from the outer peripheral portion 11, and the outer peripheral portion mounting angle Cθt is larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion 11. By designing with values, it is possible to suppress the increase in noise due to high rotation of the axial flow impeller 2 when obtaining a small, high static pressure and large air volume, and the rotation specific to the axial flow fan becomes unstable and noise It is difficult to generate a surging phenomenon in which the fan efficiency rapidly decreases and the fan efficiency decreases, and the use area of the axial flow impeller 2 can be increased because it can move to the high static pressure side, and the small fan body 1 with high static pressure and large air volume can be used. Noise can be reduced.
[0110]
In addition, reference Example 6 Then, although the impeller of the blower is the axial flow impeller 2, the same effect can be obtained by the mixed flow impeller 21.
[0111]
( reference Example 7 )
Next, the present invention reference Example 7 Will be described with reference to FIGS. 1 to 12, 26 and 27. In addition, reference Example 2 And examples 7 and reference Example 6 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0112]
As shown in the figure reference Example 2 And examples 7 In this configuration, the difference between the outer peripheral portion warpage rate Qt and the inner peripheral portion warpage rate Qb is 0.001 or more and 0.020 or less, and the difference between the outer peripheral portion attachment angle Cθt and the inner peripheral portion attachment angle Cθb is 0.1. The axial flow impeller 2 has a configuration in which the angle is not less than 6 ° and not more than 6 °.
[0113]
With the above configuration, the radial distribution of the warpage rate Q and the mounting angle Cθ, which are important factors for determining the work amount of the blade 6 of the axial flow impeller 2, here, the outer peripheral warpage rate Qt and the inner peripheral warpage rate Qb. And the difference between the outer peripheral mounting angle Cθt and the inner peripheral mounting angle Cθb, optimization is performed using an optimal level of 105 ° for the outer peripheral advance angle Aθt, and the outer peripheral warpage rate Qt is set to the outer peripheral portion 11. The value was larger than the arbitrary warp rate Q on the inner peripheral side, and the outer peripheral mounting angle Cθt was larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion 11. Due to the shape of the blade 6, the work amount of the outer peripheral portion 11 is larger than the inner peripheral portion 12 of the blade 6, and a pressure gradient is generated from the outer peripheral portion 11 to the inner peripheral portion 12. Thereby, it is possible to stop the secondary flow 17 due to the centrifugal force from the inner peripheral portion 12 toward the outer peripheral portion 11 within the boundary layer of the suction surface 15 of the blade 6, and to prevent accumulation of low energy fluid at the outer peripheral portion 11, Noise can be reduced. Therefore, by adjusting the balance between the pressure gradient from the outer peripheral portion 11 to the inner peripheral portion 12 and the secondary flow 17 from the inner peripheral portion 11 to the outer peripheral portion 12, the warp rate difference and the mounting angle difference can be optimized. The noise of the impeller 2 can be reduced. As shown in FIG. 26, it is understood that the specific noise level Ks is small when the warp rate difference is 0.001 or more and 0.020 or less. Further, the difference in warp rate becomes the minimum specific noise level Ks around 0.008. Further, as shown in FIG. 27, it is understood that the specific noise level Ks is small when the mounting angle difference is 0.1 ° or more and 6 ° or less. Further, the mounting angle difference becomes the minimum specific noise level Ks around 2 °.
[0114]
Thus, the present invention reference Example 7 According to this blower, the difference between the outer peripheral warpage rate Qt and the inner peripheral warpage rate Qb of the axial flow impeller 2 is 0.001 or more and 0.020 or less, and the outer peripheral warpage rate Qt is on the inner peripheral side from the outer peripheral portion 11. The difference between the outer peripheral mounting angle Cθt and the inner peripheral mounting angle Cθb of the axial flow impeller 2 is 0.1 ° to 6 ° and the outer peripheral mounting angle Cθt is the outer peripheral portion 11. By designing with a value larger than an arbitrary mounting angle Cθ on the inner peripheral side, it is possible to suppress an increase in noise due to a high rotation speed of the axial impeller 2 when obtaining a small, high static pressure and large air volume. The noise of the blower 1 having a small size, high static pressure, and large air volume can be reduced.
[0115]
In addition, reference Example 7 Then, although the impeller of the blower is the axial flow impeller 2, the same effect can be obtained by the mixed flow impeller 21.
[0116]
( reference Example 8 )
Next, the present invention reference Example 8 Will be described with reference to FIGS. 1 to 12 and FIG. In addition, reference Example 2-7, Example 7, 8 and The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0117]
As shown in the figure Reference examples 2, 3, 4, 5, 7 And examples 7, 8 In the configuration, the chord length L in the blade cross section 13 of an arbitrary diameter DD of the axial flow impeller 2 and the blade line 24 which is a straight line passing through the leading edge 7 of the blade 6 perpendicular to the rotating shaft 4, When the pitch T is the distance between the leading edge 7 of the blade 6 and the leading edge 7 of the blade 6 adjacent to the blade 6, the chord ratio S is given by S = L / T, and the chord ratio S is 1 The axial flow impeller 2 is set to be in the range of 1 to 1.9.
[0118]
With the above configuration, when the chord length L does not change, the distance 25 between the blades 6, that is, the pitch T is decreased, that is, the number of the blades 6 is increased, so that the flow 25 can easily follow the blades 6 even at high static pressure. The noise can be reduced by reducing the thickness of the plate. However, if the pitch T is extremely reduced, that is, if the number of blades 6 is increased too much, the number of sound sources of noise generated from each blade 6 is equal to the number of blades 6. Cause rise. Therefore, the optimization of the chordal ratio S given by S = L / T is carried out with the outer peripheral advance angle Aθt being 105 ° and the outer peripheral warpage rate Qt being larger than the arbitrary warp rate Q on the inner peripheral side from the outer peripheral portion 11. The difference between the part warp rate Qt and the inner part warp rate Qb is 0.008, the outer peripheral part mounting angle Cθt is larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral part 11, and the outer peripheral part mounting angle Cθt and the inner peripheral part. The difference from the part mounting angle Cθb was made using an optimum level of 2 °. As shown in FIG. 28, it can be seen that the chordal ratio S is 1.1 or more and 1.9 or less and the specific noise level Ks is small. Further, the chordal ratio S becomes a minimum specific noise level Ks around 1.5.
[0119]
Thus, the present invention reference Example 8 According to the blower, the chordal ratio S of the blades 6 of the axial flow impeller 2 is designed in the range of 1.1 or more and 1.9 or less, so that the shaft is small when obtaining a high static pressure and a large air volume. An increase in noise due to high rotation of the flow impeller 2 can be suppressed, and the noise of a small, high static pressure, large air volume blower can be reduced.
[0120]
In addition, reference Example 8 Then, although the impeller of the blower is the axial flow impeller 2, the same effect can be obtained by the mixed flow impeller 21.
[0121]
( reference Example 9 )
Next, the present invention reference Example 9 Will be described with reference to FIGS. In addition, Reference Example 1, Examples to Examples 6 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0122]
As shown in the figure Reference Example 1, 1st, 2nd, 3rd, 4th, 5 And examples 6 In an arbitrary radial blade section 35 cut by a plane including the rotating shaft 4 of the axial flow impeller 2, the point located closest to the suction side 18 is the apex 26, and the arbitrary blade section 35 has an arbitrary radial blade section 35. A curve 27 connecting a plurality of vertices 26 extends from the intersection of the leading edge 7 of the wing 6 or the leading edge 7 and the outer peripheral portion 11 to the intersection of the trailing edge 8 or the trailing edge 8 and the inner peripheral portion 12. It has the structure which has the axial-flow impeller 2 which passes.
[0123]
With the above configuration, the flow of the flow path 30 between the adjacent blades 6 is such that the flow 32 near the boundary layer between the hub 5 and the casing 31 is smaller than the main flow 33 and the centrifugal force due to the warp D of the blades 6 is also small. Therefore, a flow 34 from the pressure surface 16 of the blade 6 toward the suction surface 15 is generated by the pressure gradient. However, it is optional to be cut at a plane including the rotating shaft 4 that does not include the intersection between the front edge portion 7 and the outer peripheral portion 11 of the blade 6 of the axial flow impeller 2 and the intersection between the rear edge portion 8 and the inner peripheral portion 12. In the radial blade section 35, the apex 26 located closest to the suction side 18 has a convex shape on the suction surface 15 side that does not exist on the outer peripheral edge 28 or the inner peripheral edge 29 of the radial blade cross section 35. It is stopped at the outer peripheral edge 28 or the inner peripheral edge 29 of the radial blade section 35, and the formation of a pair of flow path vortices can be prevented. Further, since the flow path vortex is difficult to be formed, the formation of the accompanying vortex can be prevented, and the noise can be reduced.
[0124]
Thus, the present invention reference Example 9 According to this blower, in an arbitrary radial blade section 35 cut by a plane including the rotating shaft 4 of the axial flow impeller 2, a point located closest to the suction side 18 is defined as a vertex 26, and an arbitrary radial blade section is formed. A curve 27 connecting a plurality of vertices 26 in 35 is formed from the intersection of the leading edge 7 of the blade 6 or the leading edge 7 and the outer peripheral portion 11 with the trailing edge 8 or the trailing edge 8 and the inner peripheral portion 12. By making the shape to pass to the intersection, it is possible to suppress the increase in noise due to the high rotation of the axial flow impeller 2 when obtaining a small, high static pressure, large air volume, and small, high static pressure, large air volume The noise of the blower can be reduced.
[0125]
In addition, reference Example 9 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0126]
Further, by providing a substantially cylindrical ring 22 on the outer peripheral portion 11 of the axial flow impeller 2, it is possible to prevent the blade 6 from being deformed or broken when the axial flow impeller 2 is rotated. The shape of the axial-flow impeller 2 and the blades 6 for improving the strength to prevent deformation or destruction of the blades 6 is not limited to this.
[0127]
( reference Example 10 )
Next, the present invention reference Example 10 Will be described with reference to FIGS. In addition, reference Example 9 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0128]
As shown in the figure, in the configuration of Example 17, in the arbitrary radial blade cross section 35 cut by the plane including the rotation shaft 4 of the axial flow impeller 2, the point located closest to the suction side 18 is the vertex 26, Further, an intersection of the inner peripheral portion 12 and the rear edge portion 8 of the blade 6 of the axial flow impeller 2 is defined as a point Bh, a surface passing through the point Bh and orthogonal to the rotation shaft 4 is defined as a reference plane J, When the intersection point with the outer peripheral portion 11 is a point Bk, the vertex 26 and the point Bk are all configured to have the axial flow impeller 2 positioned on the suction side 18 from the reference plane J.
[0129]
With the above configuration, the axial impeller 2 rotates and centrifugal force works in the direction of arrow F, and the normal component Fv of the suction surface 15 of centrifugal force works by tilting the blade 6 forward to the suction side 18. The thickness of the suction surface boundary layer 35 on the suction surface 15 of the blade 6 can be suppressed, and noise can be reduced.
[0130]
Thus, the present invention reference Example 10 According to this blower, by making the blade 6 tilt forward to the suction side 18, it is possible to suppress an increase in noise due to high rotation of the axial-flow impeller 2 when obtaining a small, high static pressure and large air volume. It is possible to reduce the noise of a small, high static pressure, large air volume blower.
[0131]
In addition, reference Example 10 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0132]
( reference Example 11 )
Next, the present invention reference Example 11 Will be described with reference to FIGS. In addition, Reference examples 1, 2, Example 1 to Example 7 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0133]
As shown in the figure Reference examples 1, 2, 1st, 2nd, 3rd, 4th, 5th, 6 And examples 7 The projection figure projected on the plane perpendicular | vertical to the rotating shaft 4 when the axial-flow impeller 2 is projected to the axial direction of the rotating shaft 4 of the axial-flow impeller 2 latched by the electric motor 3 of the air blower main body 1 in the structure of , The rotation axis 4 is the origin O, the diameter 0.4082 times the axial flow impeller 2 blade diameter Dt is the virtual hub diameter KDh, and the virtual hub diameter KDh is the leading edge 7 of the blade 6 of the axial flow impeller 2. A point that bisects the virtual hub arc KAh that can be divided by the rear edge 8 is defined as a virtual hub arc center point Kh, a straight line passing through the origin O and the virtual hub arc center point Kh is a straight line X, and the origin O is the center. When the angle between the chord projection center point PR that bisects the chord projection line LR of the blade 6 that is cut by the cylindrical surface of an arbitrary diameter DD and the straight line X passing through the origin O is defined as the advance angle Aθ. A straight line connecting the wing outer peripheral projection center point Pt and the origin O, which bisects the wing outer peripheral projection line of the wing 6; The angle formed by the line X, that is, the outer circumferential advance angle Aθt is 55 ° or more and 180 ° or less with the rotational direction 10 of the axial flow impeller 2 as the positive direction, and an arbitrary advance angle Aθ on the inner peripheral side from the outer peripheral portion 11 The hub diameter Dh of the hub 5 of the axial flow impeller 2 having a value smaller than the angle Aθt and having the blade diameter Dt is in a range of 0 <Dh ≦ Dt (1-32.549 / Aθt), and The representative diameter Dm of the blade diameter Dt and the hub diameter Dh of the axial-flow impeller 2 is Dm = (((0.96Dt) 2 -(1.04Dh) 2 ) / 2) 1/2 The representative diameter advancing angle Aθd at the representative diameter Dm is configured to include the axial flow impeller 2 that takes a value of 20% to 55% of the outer peripheral advancing angle Aθt.
[0134]
With the above configuration, the representative diameter advance angle Aθd at the representative diameter Dm is a value that is 20% or more and 55% or less of the outer periphery advance angle Aθt, and the vicinity of the outer peripheral portion 11 of the blade 6 protrudes particularly in the rotation direction 10. A secondary flow 17 is induced from the inner peripheral portion 12 toward the outer peripheral portion 11 in the boundary layer of the suction surface 15 of the blade 6 by centrifugal force. However, the blade 6 of the axial-flow impeller 2 has a portion near the outer peripheral portion 11. The secondary flow 17 can be discharged from the rear edge portion 8 because it has a shape that particularly protrudes in the rotational direction 10, and accumulation of low-energy fluid at the outer peripheral portion 11 can be prevented and noise can be reduced.
[0135]
In addition, since the vicinity of the outer peripheral portion 11 protrudes particularly in the rotation direction 10, the outer peripheral portion 11 of the front edge portion 7 is not affected by the secondary flow 17 on the inner peripheral side. The backflow 20 is hardly generated near the suction side 18. Therefore, since the rotation unique to the axial flow fan becomes unstable, the surging phenomenon that the noise increases rapidly and the fan efficiency is reduced, and it can move to the high static pressure side, the use area of the axial flow impeller 2 can be increased. .
[0136]
Thus, the present invention reference Example 11 According to this blower, the representative diameter advance angle Aθd at the representative diameter Dm is 20% or more and 55% or less of the outer periphery advance angle Aθt, and the vicinity of the outer peripheral portion 11 of the blade 6 protrudes particularly in the rotation direction 10. As a result, it is possible to suppress the increase in noise due to the high rotation of the axial flow impeller 2 when obtaining a small, high static pressure and large air volume, and the rotation specific to the axial flow fan becomes unstable and the noise increases rapidly. It is difficult to generate a surging phenomenon that reduces efficiency and can move to the high static pressure side, so that the use area of the axial-flow impeller 2 can be increased, and the noise of the small, high static pressure, large air volume blower body 1 is reduced. be able to.
[0137]
In addition, reference In Example 1, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are the average values of the suction side 18 and the discharge side 19. Since the same effect can be obtained, the mixed flow impeller 21 may be used as the impeller.
[0138]
Further, by providing a substantially cylindrical ring 22 on the outer peripheral portion 11 of the axial flow impeller 2, it is possible to prevent the blade 6 from being deformed or broken when the axial flow impeller 2 is rotated. The shape of the axial-flow impeller 2 and the blades 6 for improving the strength to prevent deformation or destruction of the blades 6 is not limited to this.
[0139]
( reference Example 12 )
Next, the present invention reference Example 12 Will be described with reference to FIGS. In addition, Reference Examples 1-11, Example 1 to Example 8 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0140]
As shown in the figure, an intersection Rf between a cylindrical surface V having an arbitrary diameter DD centered on the rotation shaft 4 of the axial flow impeller 2 and the leading edge portion 7 of the blade 6 passes through the intersection Rf and the rotation shaft 4 passes through the intersection Rf. An axial flow impeller 2 having an inlet angle β1 of 90 ° or more and 180 ° or less in a substantially arcuate blade section 13 formed by the plane U and the blade 6 is defined as an arbitrary plane including a straight line parallel to the plane U. It is configured.
[0141]
With the above configuration, a very high static pressure is required to reduce the size of the device and expand the range of use of the device performance, the pressure difference between the pressure surface 16 and the suction surface 15 of the blade 6 increases, and the flow 36 is Immediately before the blade 6, it is suddenly attracted to the suction surface 15 side. Accordingly, since the inlet angle β1 in the blade cross section 13 is 90 ° or more and 180 ° or less, the flow 36 follows the blade 6, so that separation from the leading edge 7 of the blade 6 can be prevented and noise can be reduced. Become.
[0142]
Thus, the present invention reference Example 12 According to this blower, by making the inlet angle β1 90 ° or more and 180 ° or less in the blade cross section 13, it is possible to reduce the size of the axial flow impeller 2 when obtaining a high static pressure and a large air flow. The increase in noise can be suppressed, and the noise of a small, high static pressure, large air volume blower can be reduced.
[0143]
In addition, reference In Example 1, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are the average values of the suction side 18 and the discharge side 19. Since the same effect can be obtained, the mixed flow impeller 21 may be used as the impeller.
[0144]
Further, by providing a substantially cylindrical ring 22 on the outer peripheral portion 11 of the axial flow impeller 2, it is possible to prevent the blade 6 from being deformed or broken when the axial flow impeller 2 is rotated. The shape of the axial-flow impeller 2 and the blades 6 for improving the strength to prevent deformation or destruction of the blades 6 is not limited to this.
[0145]
Also, Reference Examples 1-11, Example 1 to Example 8 If the impeller is an axial-flow impeller 2, noise can be further reduced.
[0146]
(Example 21)
Next, the present invention reference Example 13 Will be described with reference to FIGS. In addition, Reference Examples 1-12, Example 1 to Example 8 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0147]
As shown in the drawing, a hub 5 that is locked to the electric motor 3 of the blower body 1 has a plurality of blades 6, and a shaft in which a cylindrical ring 40 centering on the rotating shaft 4 of the electric motor 3 is attached to the blade 6. The flow impeller 2 includes the axial flow impeller in which the auxiliary blade 37 is attached to the outer peripheral side 38 or the inner peripheral side 39 of the ring 40 so as not to be connected to the hub 5.
[0148]
With the above-described configuration, a very high static pressure is required to reduce the size of the device and expand the usage range of the device performance, and it is necessary to obtain a small size, a high static pressure, and a large air volume. There is a method of increasing the number of blades 6 in order to increase the work amount of the axial flow impeller 2 at the same rotation speed. However, if the number of blades 6 is increased, the distance between the blades 6 and the blades 6 is reduced in the vicinity of the connection between the hub 5 and the blades 6, and the flow path 30 cannot be secured. This leads to a decrease in efficiency. Therefore, since the auxiliary blade 37 is attached to the outer peripheral side 38 or the inner peripheral side 39 of the ring 40 so as not to be connected to the hub 5, the work amount of the axial flow impeller 2 can be increased at the same rotational speed by the auxiliary blade 37. The noise of the axial flow impeller 2 can be reduced with the same work amount.
[0149]
Thus, the present invention Reference Example 13 According to this blower, the axial-flow impeller 2 for obtaining a small, high static pressure and large air volume by attaching the auxiliary blade 37 to the outer peripheral side 38 or the inner peripheral side 39 of the ring 40 so as not to be connected to the hub 5. The increase in noise due to the increase in the rotation speed of the fan can be suppressed, and the noise of a small, high static pressure, large air volume blower can be reduced.
[0150]
In addition, Reference Example 13 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0151]
Moreover, although the ring 40 is made into the cylindrical shape, it is for attaching the auxiliary blade 37, and the shape of the ring 40 is not this limitation.
[0152]
Also, Reference Examples 1-12, Example 1 to Example 8 If the impeller is an axial-flow impeller 2, noise can be further reduced.
[0153]
( reference Example 14 )
Next, the present invention reference Example 14 Will be described with reference to FIGS. In addition, Reference Examples 1-13, Example 1 to Example 8 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0154]
As shown in the figure Reference Examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 1st, 2nd, 3rd, 4th, 5th, 6th, 7 And examples 8 The hub 5 that is locked to the electric motor 3 of the blower body 1 has a plurality of blades 6, and a cylindrical ring 22 centering on the rotating shaft 4 of the electric motor 3 is attached to the outer peripheral portion 11 of the blade 6. The axial flow impeller 2 includes the axial flow impeller 2 in which the flocking material 41 is attached to the outer peripheral side 38 of the ring 22.
[0155]
With the above-described configuration, a very high static pressure is required to reduce the size of the device and expand the usage range of the device performance, and the pressure difference between the suction side 18 and the discharge side 19 of the axial flow impeller 2 increases. There is a gap 42 between the axial-flow impeller 2 and the casing 31, and a backflow or pressure leakage occurs from the discharge side 19 to the suction side 18 due to a pressure difference from the gap 42. However, since the flocking material 41 is attached to the outer peripheral side 38 of the ring 22 of the axial-flow impeller 2, it is possible to prevent backflow or pressure leakage, and even if the flocking material 41 and the casing 31 come into contact with each other during rotation, noise is generated. Is less likely to occur, noise of the axial impeller 2 can be reduced, and fan efficiency can be improved.
[0156]
Thus, the present invention reference Example 14 According to this blower, by attaching the flocking material 41 to the outer peripheral side 38 of the ring 22 of the axial-flow impeller 2, the axial-flow impeller 2 can be rotated at a high speed when obtaining a small, high static pressure and large air volume. Noise can be suppressed, and the noise of a small, high static pressure, large air blower can be reduced.
[0157]
In addition, reference Example 14 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0158]
Also, Reference Examples 1-13, Example 1 to Example 8 If the impeller is an axial-flow impeller 2, noise can be further reduced.
[0159]
( reference Example 15 )
Next, the present invention reference Example 15 Will be described with reference to FIGS. In addition, Reference Examples 1-14, Example 1 to Example 8 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0160]
As shown in the figure Reference Examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 1st, 2nd, 3rd, 4th, 5th, 6th, 7 And examples 8 The hub 5 that is locked to the electric motor 3 of the blower body 1 has a plurality of blades 6, and a cylindrical ring 22 centering on the rotating shaft 4 of the electric motor 3 is attached to the outer peripheral portion 11 of the blade 6. The axial flow impeller 2 is configured to have the axial flow impeller 2 in which the shape of the outer peripheral side 38 of the ring 22 is uneven.
[0161]
With the above configuration, a very high static pressure is required in order to reduce the size of the device and expand the usage range of the device performance, and the pressure difference between the suction side 18 and the discharge side 19 of the axial flow impeller 2 becomes large. There is a gap 42 between the axial flow impeller 2 and the casing 31, and a backflow or pressure leakage occurs from the discharge side 19 to the suction side 18 due to a pressure difference from the gap 42. However, since the shape of the outer peripheral side 38 of the ring 22 of the axial flow impeller 2 is uneven, the reverse flow 43 tends to stagnate by the concave portion 44 and pass through the concave portion 44 when passing through the reverse flow 43. Since the part 45 is continuous, backflow can be prevented, and noise of the axial-flow impeller 2 can be reduced and fan efficiency can be improved.
[0162]
Thus, the present invention reference Example 15 According to this blower, since the shape of the outer peripheral side 38 of the ring 22 of the axial flow impeller 2 is uneven, the axial flow impeller 2 has a high rotation speed when obtaining a small static and high static pressure. An increase in noise can be suppressed, and the noise of a small, high static pressure, large air volume blower can be reduced.
[0163]
In addition, reference Example 15 Then, the impeller of the blower is the axial flow impeller 2, but also in the mixed flow impeller 21, the blade outer diameter Dt, the virtual hub diameter KDh, and the hub diameter Dh are set to the average values of the suction side 18 and the discharge side 19. Therefore, the mixed impeller 21 may be used as the impeller.
[0164]
Also, Reference Examples 1-14, Example 1 to Example 8 If the impeller is an axial-flow impeller 2, noise can be further reduced.
[0165]
( reference Example 16 )
Next, the present invention reference Example 16 Will be described with reference to FIGS. In addition, Reference Examples 1-15, Example 1 to Example 8 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0166]
As shown in the figure, the blades are formed by a truncated cone Z having an arbitrary suction side diameter D1 and an arbitrary discharge side diameter D2 around the rotating shaft 4 of the mixed flow impeller 21 locked to the electric motor 3 of the blower body 1. 6 is cut into a two-dimensional cross section, and the cross section impeller 21 of the blade 6 of the M-shaped center line 14 has two warp maximum points 46 on the suction surface 15 side. It has the composition which has.
[0167]
With the above configuration, a very high static pressure is required to reduce the size of the device and expand the range of use of the device performance. Therefore, since the wing 6 of the M-shaped center line 14 has two warped maximum points 46 on the suction surface 15 side, the flow 50 flowing into the wing 6 is caused by the maximal point 46 on the leading edge side 47. The pressure rises by warping, and the flow 50 has a radial component peculiar to the mixed flow impeller 21 near the minimum point 49 in the center of the blade 6, and further increases the pressure by centrifugal action. The pressure rises due to the warp of the blade 6 due to the maximum point 46 on the trailing edge side 48 of the blade 6, flows in the axial direction, and flows out of the blade 6, whereby high static pressure can be obtained at low rotation, and noise can be reduced. .
[0168]
Thus, the present invention reference Example 16 According to this blower, since the blades 6 of the M-shaped center line 14 have two warped maximum points 46 on the suction surface 15 side, the mixed flow blades are used for obtaining a small, high static pressure and a large air volume. The noise of the vehicle 2 can be suppressed, and the noise of a small, high static pressure, large air volume blower can be reduced.
[0169]
It should be noted that the provision of a substantially cylindrical ring 22 on the outer peripheral portion 11 of the axial flow impeller 2 can prevent the blade 6 from being deformed or broken when the axial flow impeller 2 is rotated, thereby achieving the same effect. The shape of the axial-flow impeller 2 and the blades 6 for improving the strength to prevent deformation or destruction of the blades 6 is not limited to this.
[0170]
( reference Example 17 )
Next, the present invention reference Example 17 Will be described with reference to FIGS. 29 and 30. FIG.
[0171]
As shown in the figure, a substantially cylindrical motor case 63 having a plurality of radial legs 62 installed in the axial direction inside a frame body 61 whose inner surface is a cylindrical surface, and rotation of a motor 64 installed therein. In the blower 67 in which the axial flow impeller 66 is locked to the axial end portion 65, the inner peripheral surface of the frame body 61 is disposed between the axial end portion 68 on the impeller side of the leg portion 62 and the axial flow impeller 66. A stationary blade 71 having a constant curvature in which the length of the outer peripheral edge 69 in contact with the outer peripheral surface of the motor case 63 is longer than the length of the inner peripheral edge 70, and the outer peripheral side inlet portion 72 t and the inner peripheral side of the convex surface of the stationary blade 71. In the inlet portion 72h, thick portions 73t and 73h having a semicircular cross section are provided.
[0172]
With the above configuration, the flow a that has passed through the axial-flow impeller 66 is increased in pressure and becomes a flow having an absolute velocity C2 having an angle in the rotational direction having a swirl component from the velocity triangle. When this flow flows into the stationary blade 71, the inflow angle αs with respect to the central axis changes in the radial position, and in an ideal state, increases as the position changes from the inner peripheral side to the outer peripheral side. In reality, however, the mixed flow becomes a mixed flow that expands in the radial direction due to the centrifugal force due to the high rotation while having a swirling component, so that the main flow flows inside the frame body 61 before flowing into the stationary blade 71 particularly on the outer peripheral side. The inflow angle αs is not constant due to interference with the secondary flow that rebounds from the peripheral surface, and the flow has various inflow angles αs. In addition, on the inner peripheral side, before flowing into the stationary blade 71, the flow has various inflow angles αs due to the influence of the backflow phenomenon. At this time, welcome smooth for any inflow angle for thick portions 73t and 73h are formed at the outer peripheral side inlet portion 72t and the inner peripheral side inlet portion 72h of the convex side of the vane 71 (suction side) It is possible to reduce the fluid loss by suppressing the peeling on the convex surface side and the generation of vortices.
[0173]
The cross-sectional diameters of the thick portions 73t and 73h are preferably in the range of 3% to 10% of the chord length L of the circumferential section of the stationary blade 71, and the radial length is 30% of the radial height H of the stationary blade 71. The following is desirable.
[0174]
The re-approach distance between the axial flow impeller 66 and the stationary blade 71 is preferably 15% or more of the blade outer diameter Dt of the axial flow impeller 66.
[0175]
Also, Any one of Reference Examples 1 to 16, or From claim 1 8 If any of the described axial-flow impellers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as a blower are further improved.
[0176]
Further, the axial flow impeller 66 may be replaced with a mixed flow impeller, and there is no difference in operation and effect.
[0177]
Thus, the present invention reference Example 17 According to this blower, fluid loss on the outer peripheral side and the inner peripheral side at the time of stationary blade inflow can be reduced, turning energy can be efficiently converted into pressure energy, total pressure efficiency can be increased, and power consumption can be reduced. Further, if the operating point (static pressure / air volume) is the same, the rotational speed can be reduced and noise can be reduced.
[0178]
( reference Example 18 )
Next, the present invention reference Example 18 Will be described with reference to FIGS. 29 and 31. FIG. In addition, the same number is attached | subjected to the same location as Example 25, and detailed description is abbreviate | omitted.
[0179]
As shown in the figure, the outer peripheral side inlet portion 74t and the inner peripheral side inlet portion 74h of the concave surface (positive pressure surface) of the stationary blade 71 are configured to have thick portions 75t and 75h having semicircular cross sections. ing.
[0180]
In the above configuration, the flow a in which the inflow angle to the stationary blade 71 is disturbed variously between the axial flow impeller 66 and the stationary blade 71, particularly on the outer peripheral side and the inner peripheral side, is thicker when flowing into the stationary blade 71. It is welcomed smoothly by the portions 75t and 75h, it is possible to suppress the peeling and vortex generation on the concave surface side, and to reduce fluid loss.
[0181]
The cross-sectional diameter of the thick portions 75t and 75h is preferably in the range of 3% to 10% of the chord length L of the circumferential section of the stationary blade 71, and the radial length is 30% of the radial height H of the stationary blade 71. The following is desirable.
[0182]
The re-approach distance between the axial flow impeller 66 and the stationary blade 71 is preferably 15% or more of the blade outer diameter Dt of the axial flow impeller 66.
[0183]
Also, Any one of Reference Examples 1 to 16, or From claim 1 8 If any of the described axial-flow impellers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as a blower are further improved.
[0184]
Also, Reference Example 17 The fluid loss can be further reduced by using the described thick portion.
[0185]
Further, the axial flow impeller 66 may be replaced with a mixed flow impeller, and there is no difference in operation and effect.
[0186]
Thus, the present invention reference Example 18 According to the blower reference Example 17 In addition to the effects of the above, fluid loss on the outer peripheral side and inner peripheral side at the time of stationary blade inflow can be reduced to that of Example 25 or more to efficiently convert turning energy into pressure energy, increasing the total pressure efficiency and reducing power consumption. it can.
[0187]
( reference Example 19 )
Next, the present invention reference Example 19 Will be described with reference to FIGS. 32 and 33. FIG. In addition, reference Example 17 and reference Example 18 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0188]
As shown in the figure, the radial height is 30% or less of the stationary blade height H, the front end 76 is less than the rear end 77 height, and the inlet of the outer peripheral side inlet portion 78 of the stationary blade 71 is shown. A plurality of auxiliary stationary vanes 79 having an inlet angle α ′ satisfying βs−5 ° <βs ′ <βs + 5 ° with respect to the angle βs are provided on the inner peripheral surface of the frame 61 between the stationary vane 71 and the axial flow impeller 66. It is the structure formed by arrangement | positioning.
[0189]
In the above configuration, the flow a that has passed through the axial flow impeller 66 between the axial flow impeller 66 and the outer peripheral side inlet portion 78 develops into a turbulent flow because the main flow interferes with the secondary flow. Before the operation, the air is rectified by the auxiliary stationary blade 79 and flows into the stationary blade 71 at an inflow angle close to the inlet angle βs of the outer peripheral side inlet portion 78, so that fluid loss at the time of inflow can be reduced.
[0190]
In addition, Any one of Reference Examples 1 to 16, or From claim 1 8 If any of the described axial-flow impellers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as a blower are further improved.
[0191]
Also, Reference Example 17 Or Reference Example 18 If either one of the above or both thick portions are used, fluid loss can be further reduced.
[0192]
Further, the axial flow impeller 66 may be replaced with a mixed flow impeller, and there is no difference in operation and effect.
[0193]
Thus, the present invention reference Example 19 According to this blower, fluid loss on the outer peripheral side at the time of stationary blade inflow can be reduced, turning energy can be efficiently converted into pressure energy, total pressure efficiency can be increased by about 5%, and power consumption can be reduced. Further, if the operating point (static pressure / air volume) is the same, the rotational speed can be reduced and noise can be reduced.
[0194]
( reference Example 20 )
Next, the present invention reference Example 20 Will be described with reference to FIG. In addition, reference Example 17 From reference Example 19 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0195]
As shown in the figure, a substantially cylindrical thin ring 80 is attached to the stationary blade 71 within the range of 30% or less of the radial height H of the stationary blade 71 from the outer circumferential side to the inner circumferential side of the stationary blade 71. It is configured to be locked.
[0196]
In the above configuration, the flow a that has passed through the axial flow impeller 66 develops into a turbulent flow because the main flow interferes with the secondary flow, particularly on the outer peripheral side between the axial flow impeller 66 and the stationary blade 71. This development region tends to develop in the radial direction from the outer periphery to the inner periphery even before passing through the stationary blade 71, but is separated and rectified by the thin ring 80, and the influence of the secondary flow on the main flow And the fluid loss when passing through the stationary blade 71 can be reduced.
[0197]
The axial length of the thin ring 80 is preferably 1 to 1.2 times the axial length of the stationary blade 71 at the installation position of the thin ring 80 in the radial direction. The re-approach distance with the flow impeller 66 is preferably 10% or more of the blade outer diameter Dt.
[0198]
Further, if the bent portion along the mixed flow is formed while paying attention to the mixed flow after passing through the axial flow impeller 66 at the front end 81, the effect is further improved.
[0199]
Also, Any one of Reference Examples 1 to 16, or From claim 1 8 If any of the described axial-flow impellers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as a blower are further improved.
[0200]
Also, Reference Examples 17 and 18 Or 19 If the described stationary blade is used, the fluid loss can be further reduced.
[0201]
Further, the axial flow impeller 66 may be replaced with a mixed flow impeller, and there is no difference in operation and effect.
[0202]
Thus, the present invention reference Example 20 According to the blower, the secondary flow that is going to develop in the radial direction from the outer periphery to the inner periphery can be separated and rectified by a thin ring to reduce fluid loss and efficiently convert the swirling energy into pressure energy. The power consumption can be reduced. Further, if the operating point (static pressure / air volume) is the same, the rotational speed can be reduced and noise can be reduced.
[0203]
( reference Example 21 )
Next, the present invention reference Example 21 Will be described with reference to FIG. In addition, reference Example 17 From reference Example 20 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0204]
As shown in the figure, a feather-like protrusion having a height of 10% or less of the radial height H of the stationary blade 71 is formed on the inner circumferential surface of the frame 61 between the outer peripheral side inlet portion 78 of the stationary blade and the axial flow impeller 66. It is the structure which planted many things 82.
[0205]
In the above configuration, the flow a passing through the axial flow impeller 66 between the axial flow impeller 66 and the outer peripheral side inlet portion 78 generates a vortex because the main flow interferes with the secondary flow, Although this vortex tends to develop greatly, the vortex is finely decomposed by the feather-like projections 82, and the turbulent flow including the vortex in the radial direction from the outer periphery to the inner periphery can be reduced, and the fluid loss can be reduced.
[0206]
In addition, Any one of Reference Examples 1 to 16, or From claim 1 8 If any of the described axial-flow impellers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as a blower are further improved.
[0207]
Also, Reference Examples 17 and 18 Or 20 If the described stationary blade is used, the fluid loss can be further reduced.
[0208]
Further, the axial flow impeller 66 may be replaced with a mixed flow impeller, and there is no difference in operation and effect.
[0209]
Thus, the present invention reference Example 21 According to this blower, generation and development of vortices in the outer peripheral portion can be reduced, fluid loss can be reduced, turning energy can be efficiently converted into pressure energy, total pressure efficiency can be increased, and power consumption can be reduced. Further, if the operating point (static pressure / air volume) is the same, the rotational speed can be reduced and noise can be reduced.
[0210]
( reference Example 22 )
Next, the present invention reference Example 22 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 21 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0211]
As shown in the drawing, a hood main body 92 having an opening on the lower surface and an exhaust port 91 in a part of the upper surface, and a suction orifice 94 having a filter 93 and a bell mouth shape or a substantially trapezoidal cross section inside the hood main body 92. The suction orifice 94 is attached to the suction port 95, and the blower main body 1 having the axial flow impeller 66 disposed between the filter 93 and the exhaust port 91 is provided.
[0212]
In the above-described configuration, the air flow including oil smoke flows from the lower surface opening of the hood main body 92, the oil smoke is removed by the filter 93, flows into the blower main body 1 from the suction orifice 94, and passes through the duct 96 from the exhaust port 91. And exhausted to the outside. At this time, when the blower main body 1 is smaller than the conventionally used centrifugal blower, if the volume excluding the blower main body in the hood is equal to the volume excluding the blower main body in the conventional hood main body, The height of the main body 92 can be further reduced, and the hood main body 92 can be reduced in weight and cost. Moreover, when this air blower is used as a range hood, the aesthetics of a kitchen are not impaired by making food | hood height low.
[0213]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0214]
Thus, the present invention reference Example 22 According to this air blower, since the height of the hood can be reduced, the weight and cost of the hood main body can be reduced.
[0215]
( reference Example 23 )
Next, the present invention reference Example 23 Will be described with reference to FIG. 1 and FIG. In addition, reference Example 1 and reference Example 17 From reference Example 22 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0216]
As shown in the figure, a hood main body 97 having a lower surface opened and an exhaust port 91 in a part of the upper surface, a filter 93 and a suction orifice 94 having a bell mouth shape or a substantially trapezoidal cross section inside the hood main body 97, The blower main body 1 having a duct 96 communicating with the exhaust port 91 and the outside of the hood main body 97 and an axial flow impeller 66 connected to an intermediate portion or an end portion of the duct 96 is provided. Yes.
[0217]
In the above configuration, when the blower main body 1 is smaller than the conventional centrifugal blower main body, it can be easily connected to an intermediate portion or an end portion of the duct 96 outside the hood main body 97 because of the axial flow. it can. In addition, since only the filter 93 and the suction orifice 94 are disposed inside the hood main body 97, the hood height can be made lower than that of the embodiment 30, and the hood main body 97 can be further reduced in weight and cost. Is possible. Moreover, when this air blower is used as a range hood, a hanging cupboard space can be ensured by making food | hood height low, and the beauty | look of a kitchen is not impaired.
[0218]
When the blower main body 1 is connected to the end of the duct 96, a part or all of the axial length is detachably disposed between the wall body 98 separating the outdoor and the indoors, or the outdoor side By being disposed on the wall surface, maintenance is improved.
[0219]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0220]
Thus, the present invention reference Example 23 According to this blower device, the hood height can be further reduced by disposing the blower main body outside the hood main body, so that the weight reduction and cost reduction of the hood main body as compared with the thirty-third embodiment can be realized.
[0221]
( reference Example 24 )
Next, the present invention reference Example 24 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 23 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0222]
As shown in the figure, a hood main body 99 having an opening on the lower surface and an exhaust port 91 on a part of the upper surface or the rear surface, a filter 93 is installed inside the hood main body 99, and the cross section has a bell mouth shape or a substantially trapezoidal shape. In the exhaust port 91, a part of the blower body 1 having the axial flow impeller 66 with the suction orifice 94 attached to the suction port 95 projects into the hood body 99 and the other part projects out of the hood body 99. It is configured to be removably locked.
[0223]
In the above configuration, when the blower main body 1 is smaller than the conventional centrifugal blower main body, only a part of the blower main body 1 protrudes into the hood main body 99 at the exhaust port 91 on the upper surface. If the volume excluding a part of the blower main body 1 inside is equal to the volume excluding the blower main body in the hood main body of Example 30, the hood height of the hood main body 99 can be made lower than that of Example 30, Since the blower body 1 can be inserted and removed, maintenance is improved, and by setting the hood height to be equal to or greater than the outer diameter dimension in the radial direction of the blower body, it can be packed and transported while being housed in the hood. Distribution costs can also be reduced. Moreover, when this air blower is used as a range hood, a hanging cupboard space can be ensured by making food | hood height low, and the beauty | look of a kitchen is not impaired.
[0224]
In addition, regarding the installation of the blower main body 1 in the case where the exhaust port 91 is provided in a part of the back surface, there is no difference in the operation effect.
[0225]
Also, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0226]
Thus, the present invention reference Example 24 According to the blower apparatus, the hood height can be made lower than that in Example 30 by disposing the blower body so that it can be inserted and removed across the inside and outside of the hood body. Light weight and low cost can be realized.
[0227]
( reference Example 25 )
Next, the present invention reference Example 25 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 24 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0228]
As shown in the figure, the air blower for smoke emission is provided with a filter 100 in which the hole diameter d of the filter surface is increased as the distance from the vicinity of the suction orifice 94 increases.
[0229]
In the above configuration, when air containing oily smoke flows into the filter 100 installed in the hood main body 99, the hole diameter d formed on the filter surface increases as the distance from the vicinity of the suction orifice 94 increases. In the case of the same filter, the amount of air passing through only the filter surface in the vicinity of the suction orifice 94 is increased, the amount of passage is biased, the trapping property is deteriorated, and the filter deterioration is accelerated. The amount of air passing through the filter surface is reduced, so that the air flows in and through from the entire surface of the filter almost uniformly, improving the collection performance and the filter life.
[0230]
Regarding the installation of the filter 100, the installation position is not limited as long as the volume of the upstream space with respect to the filter 100 in the hood main body 99 is equal.
[0231]
The re-approach distance between the filter 100 and the suction orifice 94 is desirably 30% or more of the suction port diameter Di of the blower body 1.
[0232]
Also, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0233]
Thus, the present invention reference Example 25 According to the blower of reference Example 22 , 23 Or 24 In addition to the effects of the above, it is possible to improve the collection property and the filter life.
[0234]
( reference Example 26 )
Next, the present invention reference Example 26 In 1 and 40. Will be described with reference to FIG. In addition, reference Example 1 and reference Example 17 From reference Example 25 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0235]
As shown in the figure, the inner surface has slit-like openings 102i and 102o communicating with the inside and the outside of the main body 101 on the upstream side surface and the downstream upper surface of the main body 101 having a cylindrical surface. The filter 103 is disposed inside the 102i.
[0236]
In the above configuration, since the opening 102 i is formed on the side surface of the main body 101, dirty air can flow in from the entire periphery of the main body 101, and if the axial flow impeller 66 is reduced in size, a conventional centrifugal impeller can be used. Compared to the air purifier used, the size of the main body can be greatly reduced in size and weight, and it can be carried freely.
[0237]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0238]
In addition, the shapes and positions of the openings 102i and 102o are not limited to the present embodiment as long as the respective opening areas are equal.
[0239]
In addition, material, packaging, and transportation costs can be reduced by reducing the size and weight. Thus, according to the air blower of Example 34 of the present invention, the dust collection range and direction can be expanded, and a small, lightweight, and low-cost air purifying air blower can be realized.
[0240]
( reference Example 27 )
Next, the present invention reference Example 27 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 26 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0241]
As shown in the figure, the inner surface has slit-shaped openings 105i and 105o communicating with the inside and the outside of the main body 104 on the upstream side surface and the downstream upper surface of the main body 104 having a cylindrical surface. The filter 106 is disposed inside the 105o.
[0242]
In the above configuration, since the opening 105i is formed on the side surface of the main body 104 as in the case of the embodiment 34, dirty air can flow from the entire circumference of the main body 104, and if the axial flow impeller 66 is reduced in size, it is conventional. Compared to a blower for air purification using a centrifugal impeller, the size of the main body can be greatly reduced in size and weight, and it can be carried freely. .
[0243]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0244]
Further, the shapes and positions of the openings 105i and 105o are not limited to the present embodiment as long as the respective opening areas are equal.
[0245]
In addition, material, packaging, and transportation costs can be reduced by reducing the size and weight.
[0246]
Thus, the present invention reference Example 27 According to this blower, the dust collection range and direction can be expanded, and a small, lightweight and low-cost air purifier blower can be realized.
[0247]
( reference Example 28 )
Next, the present invention reference Example 28 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 27 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0248]
As shown in the figure, the filter is a super high performance filter 107.
[0249]
In the above configuration, the pressure loss during ventilation of the ultra-high performance filter 107 (such as HEPA) that can collect fine dust is increased compared to the normal air cleaning filter, but the mounted blower achieves high static pressure. Since it is a blower that can be used, an increase in pressure loss can be sufficiently compensated, and there is no need to increase the opening areas of the main body 101 and the openings 102i and 102o.
[0250]
Thus, the present invention reference Example 28 According to the blower device, in addition to the operational effects of the embodiment 34 or 35, the dust collection performance can be improved without impairing the blower performance by installing the ultra-high performance filter.
[0251]
( reference Example 29 )
Next, the present invention reference Example 29 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 28 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0252]
As shown in the figure, a part of the side surface of the main body 101 has a slit window 109 using an acrylic material or the like that transmits light over the entire circumference, and the lighting device 108 is attached to the end of the electric motor 64. Yes.
[0253]
In the above configuration, the installed fan is a fan that can achieve small size, high static pressure and low noise, so it can be installed in indirect lighting in the living room in the house and in the lighting under the feet in the bedroom. Since it is easy to carry and improved, it can be used for various lighting applications.
[0254]
Thus, the present invention reference Example 29 According to the blower of reference Example 26 , 27 Or 28 In addition to the above effects, it can be used for various lighting applications.
[0255]
( reference Example 30 )
Next, the present invention reference Example 30 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 29 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0256]
As shown in the figure, a suction orifice 111 having a bell mouth shape or a substantially trapezoidal cross section and a body mounting bracket 112 having a rotating means are provided.
[0257]
In the above configuration, one end of the main body mounting bracket 112 is connected to the blower body 1 and the other end is
By adhering to the wall surface on the indoor side, the air in the vicinity of the floor cooled by an air conditioner or the like can be circulated to the ceiling side by directing the opening of the suction orifice 111 toward the floor during summer use. The temperature distribution in the indoor space can be made uniform. In addition, when used in winter, the air in the vicinity of the ceiling surface heated by an air conditioner or the like is circulated to the floor surface side by directing the opening of the suction orifice 111 toward the ceiling surface side by the body mounting bracket 112 having a rotating means. The temperature distribution in the indoor space can be made uniform.
[0258]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0259]
Thus, the present invention reference Example 30 According to this blower, the temperature distribution in the indoor space can be made uniform by the circulation action.
[0260]
( reference Example 31 )
Next, the present invention reference Example 31 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 30 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0261]
As shown in the figure, a suction orifice 111 having a bell mouth shape or a substantially trapezoidal cross section, a main body mounting bracket 112 having a rotating means, one open end is a round hole shape, and the other open end is elongated. A linear blowout diffusion louver 114 having one or a plurality of wind direction fins 113 is provided in the square hole, and the opening end of the round hole of the linear blowout diffusion louver 114 is used as a blowout opening 115. It has a connected configuration.
[0262]
In the above configuration, by making the elongated opening area of the linear blowing diffusion louver 114 smaller than the other opening area, the flow velocity can be increased, and even if this blower is attached to the wall surface of a large living room space, The vibration effect is sufficiently possible. Further, by changing the direction of the wind direction fin 113, the direction of the blowing flow can be changed locally or diffusely.
[0263]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0264]
Thus, the present invention reference Example 31 According to this blower, the range of the circulatory action can be expanded by increasing the flow velocity of the blowout flow by the linear blowout diffusion louver, and the direction of the blowout flow can be freely changed by the wind direction fin 113.
[0265]
( reference Example 32 )
Next, the present invention reference Example 32 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 31 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0266]
As shown in the figure, a suction orifice 111 having a bell mouth shape or trapezoidal cross section, a body mounting bracket 112 having a rotating means, and a guide 116 having a bell mouth shape or trapezoidal cross section and a substantially conical shape inside. The annular blowout diffusion louver 117 having the above-described configuration is provided, and the annular blowout diffusion louver 117 is connected to the blowout port 115.
[0267]
In the above configuration, the area of the opening on the downstream side of the annular blowing diffusion louver 117 is the same as that of the upstream
By making the area smaller than the mouth area, the flow velocity of the blowout flow can be increased, and further, the guide 116 in the annular blowout diffusion louver 117 forms an annular blowout. Even if this blower is attached, a wide range of circulation action is sufficiently possible.
[0268]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0269]
Thus, the present invention reference Example 32 According to the blower, a wide circulation operation can be realized by the annular blowing diffusion louver.
[0270]
( reference Example 33 )
Next, the present invention reference Example 33 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 32 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0271]
As shown in the figure, a suction orifice 111 having a bell mouth shape or a substantially trapezoidal cross section, a main body mounting bracket 112 having a rotating means, one or a plurality of wind direction fins 118 inside, and a rotation The rotary diffusion louver 119 having a rotating means that rotates in the circumferential direction of the shaft 4 is provided, and the rotary diffusion louver 119 is connected to the outlet 115.
[0272]
In the above configuration, even if all the wind direction fins 118 are directed in the same direction (in some cases, in one direction), the rotating diffusion louver 119 itself is rotated by the rotating means that rotates in the circumferential direction of the rotating shaft 4, so that a large amount of air flow is generated. It can be spread over a wide area, and even if this blower is attached to the ceiling surface or wall surface of a large living room space, the circulation effect is improved.
[0273]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0274]
Thus, the present invention reference Example 33 According to this blower, a wide circulation operation with a large air volume can be realized by the rotary diffusion louver.
[0275]
( reference Example 34 )
Next, the present invention reference Example 34 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 33 The same number is attached | subjected to the same location and detailed description is abbreviate | omitted.
[0276]
As shown in the figure, there is an opening 122 for supply / discharge at the top and bottom of one or both opposing side walls 121 or below the other side wall 121 facing the upper side of one side wall 121. The side wall surface between the parts 122 is arranged inside a box-shaped wall building material unit 125 having an inspection port 123 and an inspection door 124.
[0277]
In the above configuration, the air blower body 1 having a high static pressure and a large air volume is installed in the internal space of the building material unit 125 from the inspection port 123, and the air tightness of the internal space of the building material unit 125 is increased, thereby Inflow and outflow are possible. Moreover, since it is not necessary to pipe the connection duct, the construction is saved. In addition, by using the building material unit 125, it can be used for ventilation between the first floor and the second floor, the adjacent room, the room, and the outside in a house and a non-house.
[0278]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0279]
Thus, the present invention reference Example 34 According to the air blower, the wall body and the air blower are integrated, so that the construction can be saved and the ventilation system can be diversified.
[0280]
( reference Example 35 )
Next, the present invention reference Example 35 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 34 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0281]
As shown in the figure, a suction orifice 126 having a bell mouth shape or a substantially trapezoidal cross section, a main body mounting bracket 112 having a rotating means, and a blowout louver 127 whose air passage cross-sectional area decreases from upstream to downstream. And one or a plurality of them are installed in the air blowing direction.
[0282]
In the above-described configuration, the axial flow impeller is rotated by the electric motor of the blower body 1, and the passing wind speed is increased by reducing the air blowing cross-sectional area from the upstream side to the downstream side, that is, the blowing direction from the blowing side of the blower body 1. The blow-out louver 127 allows a large air transfer distance, and further, a suction orifice 126 for reliably collecting the dirty air around the blower body 1 and the transported air is sucked into the blower body 1. The cross-sectional shape including the rotating shaft of the axial flow impeller is provided in a bell mouth shape or a substantially trapezoidal shape. Therefore, by installing one or a plurality of the blower main body 1 in the direction in which it is desired to blow air, ventilation air can be blown even without a duct facility, and a low-cost, low-cost construction blower can be realized. Further, since the main body mounting bracket 112 of the blower body 1 is rotatable, it is possible to reverse the blower body 1 when it is desired to change the blowing direction. This blower can be used mainly in a factory with a high ceiling height where it is difficult to install a duct, or in an environment where the ceiling height is low and a duct with many beams is difficult to install, such as an underground parking lot.
[0283]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0284]
Thus, the present invention reference Example 35 According to this blower, it is possible to realize a low-cost and labor-saving blower capable of ventilating and blowing without duct equipment.
[0285]
( reference Example 36 )
Next, the present invention reference Example 36 Will be described with reference to FIG. 1 and FIG. In addition, reference Example 1 and reference Example 17 From reference Example 35 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0286]
As shown in the figure, an air purifying filter 128 is provided at the middle or end of the upstream or downstream duct 96.
[0287]
In the above configuration, when the axial flow impeller is rotated by the electric motor of the blower body 1 and air is supplied by the blower body 1, the air purifying filter 128 is disposed at the middle portion or the end of the duct 96 upstream or downstream of the blower body 1. By installing it, it is possible to prevent dust, dust, pollen and viruses contained in the air from the outside from entering the room. Further, when ventilating dirty air in the room, the concept of ventilation is extended from the room to the environment, and an air purifying filter 128 is disposed in the middle or end of the duct 96 upstream or downstream of the blower body 1. As a result, it is not necessary to directly discharge dirty air, and environmental pollution can be prevented. Note that this blower can be used mainly in clean rooms, hospitals, living rooms, and non-living rooms where a clean air environment is required.
[0288]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0289]
Thus, the present invention reference Example 36 According to this air blower, it is possible to realize a blower capable of preventing dust, dust, pollen, and viruses contained in air from the outside from entering the room by disposing the air purifying filter 128. it can.
[0290]
( reference Example 37 )
Next, the present invention reference Example 37 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 36 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0291]
As shown in the figure, a deodorizing unit 129 is disposed in the middle or end of a duct 96 upstream or downstream.
[0292]
In the above configuration, it has been conventional to exhaust dirty indoor air directly outside the room, but the position of the exhaust is limited due to problems of odor and oil smoke exhausted in dense houses and condominiums. It is coming. Therefore, the concept of ventilation is extended from the room to the environment, and the deodorizing unit 129 is disposed at the middle or end of the duct 96 upstream or downstream of the blower body 1 when exhausting dirty air outside the room. By doing so, since the dirty air is discharged without deodorizing directly, it can be designed freely without being restricted in the position direction of the exhaust, and environmental pollution can also be prevented. In addition, when the axial flow impeller is rotated by the electric motor of the blower main body 1 and air is supplied by the blower main body 1, the deodorizing unit 129 is disposed in the middle portion or the end of the duct 96 upstream or downstream of the blower main body 1. Therefore, it is possible to prevent an unpleasant odor contained in the air from the outside from entering the room.
[0293]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0294]
Thus, the present invention reference Example 37 According to this air blower, by disposing the deodorizing unit 129, the air blower can be deodorized and exhausted at the time of exhaust, so that the position of the exhaust is not restricted and environmental pollution can be prevented. Can be realized.
[0295]
( reference Example 38 )
Next, the present invention reference Example 38 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 37 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0296]
As shown in the figure, a silencer unit 130 is arranged at the middle or end of the upstream or downstream duct 96.
[0297]
In the above configuration, when the axial-flow impeller is rotated by the electric motor of the blower body 1 and exhaust and supply of air are performed by the blower body 1, the silencer unit 130 is provided at the middle or end of the duct 96 upstream or downstream of the blower body 1. By disposing, it is possible to prevent intrusion of noise from the outside. The blower is mainly used in buildings and houses located in a noisy environment.
[0298]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0299]
Thus, the present invention reference Example 38 According to this blower, it is possible to realize a blower capable of preventing the intrusion of noise from outside by disposing the silencer unit 130.
[0300]
( reference Example 39 )
Next, the present invention reference Example 39 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 38 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0301]
As shown in the figure, there is an opening 122 for supplying and discharging on the upper and lower sides of one side surface or below the other side surface facing or adjacent to the upper side of one side surface. It is configured so as to be disposed inside an elongated box-shaped column building material unit 131 having an inspection port 123 on one side surface.
[0302]
In the above configuration, the axial flow impeller is rotated by the electric motor of the blower main body 1, air flows inside the pillar building material unit 131, and the upper opening 122 is used as a suction port and the lower opening 122 is used during heating in winter. By using the air outlet, it is possible to eliminate uneven temperature by moving the warm air in the room downward and circulating the air in the room, that is, by circulation. As a result, the energy-saving operation of the air-conditioning equipment is possible, the running cost can be reduced, and comfortable air-conditioning can be performed. The same effect as in winter can be obtained by inverting the blower body during cooling in summer. The blower can be used mainly in living rooms, halls, lobbies, stairs, and atriums where air with high ceiling height is difficult to circulate.
[0303]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0304]
Thus, the present invention reference Example 39 According to the blower device, by disposing the blower body 1 inside the elongated box-shaped column building material unit 131, it is possible to eliminate indoor temperature unevenness by circulating indoor air. Comfortable air conditioning is possible with energy-saving operation of air conditioning equipment.
[0305]
( reference Example 40 )
Next, the present invention reference Example 40 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 39 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0306]
As shown in the figure, a substantially cylindrical or box-shaped blower main body 1 is provided with a support frame 132 and a substantially cylindrical or box-shaped insertion / removal adapter 133 that can be inserted into and removed from the support frame 132. It is configured to be fixed in the insertion / removal adapter 133.
[0307]
In the above configuration, when the opening 122 is provided in the wall of a living room without a ceiling pocket, the fan body 1 is attached to the end of the duct 96 and the support frame 132 of the substantially cylindrical or box-shaped fan body 1 and the support frame. By providing a generally cylindrical or box-shaped insertion / removal adapter 133 that can be inserted / removed in the body 132, the blower main body 1 fixed in the insertion / removal adapter 133 can be easily taken out simultaneously with the insertion / removal adapter 133. The maintenance of the blower main body 1 becomes very simple, a maintenance-saving blower can be realized, and the grill 134 of the opening 122 can be made small, so that a blower that does not impair the aesthetics can be realized. Note that the wall of the living room without the ceiling may be used as the outer wall of the building, and the opening 122 may be either a suction port or a blow-out port.
[0308]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0309]
Thus, the present invention reference Example 40 According to this blower apparatus, the blower main body 1 can be easily taken out simultaneously with the insertion / removal adapter 133 by providing the support body 132 and the insertion / removal adapter 133 on the blower main body 1 and being fixed in the insertion / removal adapter 133. Thus, an air-saving device with reduced maintenance can be realized.
[0310]
( reference Example 41 )
Next, the present invention reference Example 41 Will be described with reference to FIGS. 1 and 55. FIG. In addition, reference Example 1 and reference Example 17 From reference Example 40 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0311]
As shown in the figure, a fixing bracket 136 having an inspection opening 122 and an opening / closing door 135 on a part of the ceiling surface, and an adjusting means for alignment with a duct 96 is provided on the back side of the ceiling of the opening / closing door 135. The connection adapter 137 has a means and a shape that are fixed and can be attached to and detached from the duct 96.
[0312]
In the above configuration, when installing the blower main body 1, the inspection opening 122 and the opening / closing door 135 are always required on a part of the ceiling surface. Therefore, using the door 135, the fan body 1 is fixed to the ceiling back side of the door 135 using a fixing metal fitting 136 having a means for adjusting the alignment with the duct 96, and the means and the shape that can be attached to and detached from the duct 96. Since the blower body 1 can be detached from the duct 96 at the same time as opening and closing the opening / closing door 135, the blower body 1 can be easily assembled and saved, and also at the time of inspection. The blower body 1 is also separated from the duct 96 at the same time as the opening / closing door 135 is opened, and the blower can be lowered below the ceiling surface while being fixed to the opening / closing door 135. Maintenance is also easy because it is connected.
[0313]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0314]
Thus, the present invention reference Example 41 According to this air blower, the blower main body 1 can be detached from the duct 96 at the same time as the opening / closing door 135 is opened / closed, and the blower main body 1 can be easily assembled and inspected, thereby realizing a blower device with reduced construction and maintenance. it can.
[0315]
( reference Example 42 )
Next, the present invention reference Example 42 Will be described with reference to FIGS. In addition, reference Example 1 and reference Example 17 From reference Example 41 The same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0316]
As shown in the figure, a supply / discharge unit 138 having an elongated opening 122 at the outdoor side end of a duct 96 communicating between the room and the outside, or a box-shaped supply / discharge box 139 having an opening 122 on one side, The duct 96 is arranged at the middle or end of the duct 96.
[0317]
In the above configuration, by installing the supply / discharge unit 138 or the supply / discharge box 139 under the eaves of the roof of the building, it is possible to prevent the intrusion of rain from the outdoor side, and the air blower that does not impair the beauty because it is in an inconspicuous position Can be realized.
[0318]
In addition, Any one of Reference Examples 1 to 21 or From claim 1 8 If any one of the described blowers is used, the size can be reduced, and various performances (static pressure, air volume, efficiency, noise) as the blower can be further improved.
[0319]
Thus, the present invention reference Example 42 According to this blower, by installing the supply / discharge unit 138 or the supply / discharge box 139 under the eaves of the roof of the building, it is possible to realize a blower capable of preventing rain from entering from the outdoor side.
[0320]
【The invention's effect】
As described above, as is clear from the embodiments, according to the present invention, the noise of the axial-flow impeller that can obtain a small and high static pressure and a large air volume can be reduced, and the occurrence of the surging phenomenon can be reduced to the high static pressure side. It is possible to provide a low noise blower that can minimize the range as well as the transition and establish the design method of the axial flow impeller.
[0321]
In addition, it is possible to provide a blower that has a swirling component after passing through the axial flow impeller, efficiently recovers a flow disturbed by a secondary flow or a reverse flow, reduces fluid loss, and consequently reduces power consumption.
[0322]
In addition, by using a low-noise, low-noise axial-flow impeller blower that can obtain a high static pressure and a large air volume, it is possible to develop a wide range of applications that could not be achieved with conventional ventilation and air-conditioning equipment. It can be carried out.
[Brief description of the drawings]
FIG. 1 of the present invention reference Side sectional view of the blower of Example 1
[Fig. 2] Front view of the main part
[Fig. 3] Cross-sectional view of the same part
[Fig. 4] Front view of the main part
FIG. 5 is a side cross-sectional view of the main part.
FIG. 6 is a side sectional view of the main part.
Fig. 7 Front view of the main part
FIG. 8 Example 6 Main part front view
[Figure 9] reference Example 2 Side view of the main part
FIG. 10 is a side sectional view of the main part.
FIG. 11 is a side sectional view of the main part.
FIG. 12 Example 7 Side view of the main part
[Figure 13] reference Example 11 Main part front view
FIG. 14 is a front view of the main part.
Fig. 15 reference Example 12 Main part front view
FIG. 16 is a sectional view of the main part.
Fig. 17 reference Example 13 Main part front view
Fig. 18 reference Example 14 Side view of the main part
FIG. 19 reference Example 15 Side view of the main part
FIG. 20 reference Example 16 Side view of the main part
FIG. 21 is a sectional view of the main part.
Fig. 22 reference Performance characteristic diagram of specific noise level Ks at outer peripheral advance angle Aθt of Example 1
FIG. 23 Example 1 Characteristics chart of specific noise level Ks with different warp rate differences
FIG. 24 Example 3 Characteristic chart of specific noise level Ks at different mounting angle
FIG. 25 Example 6 Performance characteristic diagram of specific noise level Ks at 2-string joint ratio S
FIG. 26 Example 8 Characteristics chart of specific noise level Ks with different warp rate differences
FIG. 27 reference Example 5 Characteristic chart of specific noise level Ks at different mounting angle
FIG. 28 reference Example 8 Characteristic chart of specific noise level Ks at string joint ratio S
FIG. 29 reference Example 17 and 18 Side sectional view of
FIG. 30 (a) Same as above reference Example 17 Of the outer peripheral side of the rotor blades and stator blades
(B) Inner peripheral side circumferential sectional view
(C) Velocity diagram of air flow by rotation of the moving blade
FIG. 31 (a) Same as above reference Example 18 Of the outer peripheral side of the rotor blades and stator blades
(B) Inner peripheral side circumferential sectional view
Fig. 32 reference Example 19 Side sectional view of
FIG. 33 is a sectional view of the main part.
FIG. 34 reference Example 20 Side sectional view of
FIG. 35 reference Example 21 Side sectional view of
Fig. 36 reference Example 22 Side view
Fig. 37 reference Example 23 Side view
FIG. 38 (a) reference Example 24 Side view
(B) Side view
(C) Side view during storage and packing
FIG. 39 reference Example 25 Front sectional view of
FIG. 40 reference Example 26 Cross section of
FIG. 41 reference Example 27 Cross section of
FIG. 42 reference Example 28 Cross section of
FIG. 43 reference Example 29 Cross section of
FIG. 44 (a) reference Example 30 Side view during summer use
(B) Side view when using in winter
(C) Plan view
FIG. 45 (a) Same as above reference Example 31 Perspective view
(B) Side view
FIG. 46 (a) reference Example 32 Perspective view
(B) Side view
FIG. 47 (a) reference Example 33 Perspective view
(B) Side view
FIG. 48 (a) Same as above reference Example 34 Perspective view
(B) The perspective view
(C) Side view
FIG. 49 reference Example 35 Side view
FIG. 50 reference Example 36 Top view of
Fig.51 (a) Same reference Example 37 Side sectional view of
(B) Cross-sectional side view
FIG. 52 reference Example 38 Side sectional view of
Fig. 53 reference Example 39 Perspective view
Fig. 54 (a) Same as above reference Example 40 Side sectional view of
(B) Side view
Fig. 55 (a) Same as above reference Example 41 Perspective view
(B) Side view
Fig. 56 (a) Same as above reference Example 42 Perspective view
(B) Side view
FIG. 57 is a side view of a conventional blower
Fig. 58 Front view of the main part
Fig. 59 is a front view of the main part.
Fig. 60 is a sectional view of the main part.
Fig. 61 Front view of the main part
FIG. 62 is a sectional side view of the same part.
Fig. 63 is a front sectional view of the main part of the same.
FIG. 64 is a cross-sectional view of the same side
FIG. 65 is a sectional view of the main part.
[Explanation of symbols]
1 Blower body
2 Axial impeller
3 Electric motor
4 Rotating shaft
5 Hub
6 wings
O Origin
Dt Blade diameter
KDh Virtual hub diameter
7 Front edge
8 Rear edge
KAh Virtual hub arc
Kh Virtual hub arc center point
X straight line
DD diameter
LR chord projection line
PR chord projection center point
Aθ Advance angle
9 Projection line of inner wing
Pt wing outer periphery projection center point
Aθt Outer circumference advance angle
10 Direction of rotation
11 Outer part
12 Inner circumference
Dh Hub diameter
13 Wing cross section
14 Centerline
L chord length
D Warpage
Qt Peripheral warpage rate
Cθ Mounting angle
Cθt outer peripheral mounting angle
T pitch
15 Suction surface
16 Positive pressure surface
17 Secondary flow
18 Suction side
19 Discharge side
20 Backflow
21 mixed flow impeller
22 rings
23 chord
24 cascade line
25 Flow
26 Vertices
27 Curve
28 outer periphery
29 Inner edge
30 channels
31 Casing
32 Flow
33 Mainstream
34 Flow
35 Radial wing cross section
Bh point
J Reference plane
Bk points
Fv normal component
V Cylindrical surface
Rf intersection
U plane
β1 entrance angle
36 Flow
37 Aileron
38 Outer peripheral side
39 Inner circumference
40 rings
41 Flocking material
42 Clearance
43 Backflow
44 recess
45 Convex
D1 Suction side diameter
D2 Discharge side diameter
46 maximum points
47 Leading edge side
48 trailing edge
49 local minimum
50 Flow
61 Frame
62 legs
63 Motor case
64 Electric motor
65 Rotating shaft end
66 Axial flow impeller
67 Blower
68 Axial end
69 outer periphery
70 Inner rim
71
72t entrance
72h entrance
73t thick part
73h Thick part
74t entrance
74h entrance
75t thick part
75h thick part
H Height of stator blade
76 Front end
77 Rear end
78 Outer peripheral entrance
79 Auxiliary vanes
βs entrance angle
βs' entrance angle
80 Thin ring
81 front end
82 Feather-shaped projections
91 Exhaust port
92 Hood body
93 Filter
94 Suction orifice
95 Suction port
96 Duct
97 Hood body
99 Body mounting bracket
d Hole diameter
100 filters
101 body
102i opening
102o opening
103 Filter
104 body
105i opening
105o opening
106 Filter
107 Super high performance filter
108 Lighting equipment
111 Suction orifice
112 Body mounting bracket
113 Wind direction fin
114 Linear Balloon Diffusion Louver
115 Outlet
116 Guide
117 Annular blowout diffusion louver
118 Wind direction fin
119 Rotating diffusion louver
121 side wall
122 opening
123 Inspection port
124 Inspection door
125 Building material unit for walls
126 Suction orifice
127 louver
128 Air purification filter
129 Deodorizing unit
130 Silencer unit
131 Building material unit for pillars
132 Support frame
133 Insertion / removal adapter
135 door
136 Fixing bracket
137 Connection adapter
138 Supply / discharge unit
139 Supply / Discharge Box
201 Blower body
202 Axial impeller
204 Rotating shaft
205 hub
206 Wings
208 trailing edge
210 Direction of rotation
211 outer periphery
212 Inner circumference
213 Wing cross section
214 Centerline
215 Suction surface
216 positive pressure surface
217 Secondary flow
218 Suction side
219 Discharge side
220 Backflow
230 flow path
231 casing
232 flow
233 mainstream
234 flow
252 Channel vortex
255 Centrifugal impeller
256 fluid
257 box
258 spiral casing
O 'origin
Ph 'projection center point of inner wing
X 'straight line
DD 'diameter
LR 'chord projection line
PR 'chord projection center point
Aθ 'advance angle
Aθt 'Peripheral advance angle
Cθ 'Mounting angle
L 'chord length
D 'Warp
260 vane
261 outer periphery
262 Inner edge
263t entrance
263h entrance
H.264 frame

Claims (8)

軸流羽根車の回転軸を含む平面で切断される任意の翼断面において、最も吸込側に位置する点を頂点とし、任意の前記翼断面における複数の頂点を結ぶ曲線が、前記翼の前縁部またはその前縁部と外周部との交点から、後縁部またはその後縁部と内周部との交点まで通り、また前記軸流羽根車の翼の内周部と後縁部との交点を点Ｂｈとして、その点Ｂｈを通り回転軸を直交する面を基準面Ｊとし、前記後縁部と外周部との交点を点Ｂｋとするとき、前記頂点と前記点Ｂｋが前記基準面Ｊよりすべて前記吸込側に位置する前記軸流羽根車を有する送風機。   In an arbitrary blade cross section cut by a plane including the rotational axis of the axial flow impeller, a curve that connects a plurality of vertices in any blade cross section with a point positioned closest to the suction side as a vertex is a leading edge of the blade Or the intersection of the front edge and the outer periphery of the head portion to the intersection of the rear edge or the rear edge and the inner periphery, and the intersection of the inner and rear edges of the blades of the axial impeller Is a point Bh, a plane passing through the point Bh and orthogonal to the rotation axis is a reference plane J, and an intersection of the trailing edge and the outer peripheral portion is a point Bk, the vertex and the point Bk are the reference plane J A blower having the axial-flow impeller positioned more on the suction side. 軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、その翼断面における中心線は略円弧形状とし、前記翼断面の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部の翼断面における外周部反り率Ｑｔが、前記外周部より内周側の任意の前記反り率Ｑより大きな値をとる前記軸流羽根車を有する請求項１記載の送風機。A blade section obtained by cutting a blade with a cylindrical surface of an arbitrary diameter DD centered on the rotation axis of an axial flow impeller and developing the section in two dimensions, and the center line in the blade section is a substantially arc shape, The warp rate Q is given by Q = D / L by the chord length L and warp D of the blade cross section, and the outer peripheral warp rate Qt in the blade cross section of the outer peripheral portion is any warpage on the inner peripheral side from the outer peripheral portion. blower according to claim 1 having the axial flow impeller which takes a value greater than the rate Q. 軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、その翼断面における中心線は略円弧形状とし、翼断面の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部の翼断面における外周部反り率Ｑｔが、前記外周部より内周側の任意の前記反り率Ｑより大きな値をとり、前記外周部反り率Ｑｔと前記翼の内周部の翼断面における内周部反り率Ｑｈとの差が０．００１以上０．０２０以下になる前記軸流羽根車を有する請求項１記載の送風機。   A blade section obtained by cutting a blade with a cylindrical surface of an arbitrary diameter DD centered on the rotational axis of an axial flow impeller and developing the section in two dimensions, and the center line in the blade section has a substantially arc shape, The warp rate Q with the chord length L and the warp D of the blade cross section is given by Q = D / L, and the outer peripheral warpage rate Qt in the blade cross section of the outer peripheral portion is an arbitrary warpage rate on the inner peripheral side from the outer peripheral portion. The axial flow impeller having a value larger than Q and having a difference between the outer peripheral warpage rate Qt and the inner peripheral warpage rate Qh in the blade cross section of the inner peripheral portion of the blade is 0.001 or more and 0.020 or less. The blower according to claim 1. 軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、翼弦と、回転軸と垂直で翼の前縁部を通る直線である翼列線とのなす角を取付角Ｃθとし、外周部の翼断面における外周部取付角Ｃθｔが、前記外周部より内周側の任意の前記取付角Ｃθより大きな値をとる前記軸流羽根車を有する請求項１記載の送風機。   A blade cross-section obtained by cutting a blade on a cylindrical surface of an arbitrary diameter DD centered on the rotation axis of an axial-flow impeller and developing the cross-section two-dimensionally. An angle formed with a blade row line that is a straight line passing through the edge portion is a mounting angle Cθ, and the outer peripheral mounting angle Cθt in the blade cross section of the outer peripheral portion is larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion. The blower according to claim 1, wherein the blower has the axial flow impeller. 軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、翼弦と、回転軸と垂直で翼の前縁部を通る直線である翼列線とのなす角を取付角Ｃθとし、外周部の翼断面における外周部取付角Ｃθｔが、前記外周部より内周側の任意の前記取付角Ｃθより大きな値をとり、前記外周部取付角Ｃθｔと前記翼の内周部の翼断面における内周部取付角Ｃθｈとの差が０．１゜以上６゜以下になる前記軸流羽根車を有する請求項１記載の送風機。   A blade cross-section obtained by cutting a blade on a cylindrical surface of an arbitrary diameter DD centered on the rotation axis of an axial-flow impeller and developing the cross-section two-dimensionally. An angle formed with a blade row line that is a straight line passing through the edge portion is a mounting angle Cθ, and the outer peripheral mounting angle Cθt in the blade cross section of the outer peripheral portion is larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral portion. The axial-flow impeller has a difference between the outer peripheral mounting angle Cθt and the inner peripheral mounting angle Cθh in the blade cross section of the inner peripheral portion of the blade being 0.1 ° or more and 6 ° or less. The blower described. 軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、その翼断面における中心線は略円弧形状とし、前記翼断面の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部の翼断面における外周部反り率Ｑｔが、前記外周部より内周側の任意の前記反り率Ｑより大きな値をとり、かつ、前記翼断面における翼弦と、回転軸と垂直で翼の前縁部を通る直線である翼列線とのなす角を取付角Ｃθとし、前記外周部の翼断面における外周部取付角Ｃθｔが、前記外周部より内周側の任意の前記取付角Ｃθより大きな値をとる前記軸流羽根車を有する請求項１記載の送風機。   A blade section obtained by cutting a blade with a cylindrical surface of an arbitrary diameter DD centered on the rotational axis of an axial flow impeller and developing the section in two dimensions, and the center line in the blade section has a substantially arc shape, The warp rate Q with the chord length L and warp D of the blade cross section is given by Q = D / L, and the outer periphery warp rate Qt in the blade cross section of the outer peripheral portion is the arbitrary warpage on the inner peripheral side from the outer peripheral portion. An angle formed between a chord in the blade cross section and a blade row line that is perpendicular to the rotation axis and passes through the leading edge of the blade is a mounting angle Cθ. The blower according to claim 1, wherein the axial flow impeller has an outer peripheral portion mounting angle Cθt in the blade cross section that is larger than an arbitrary mounting angle Cθ on the inner peripheral side of the outer peripheral portion. 軸流羽根車の回転軸を中心とする任意の直径ＤＤの円筒面で翼を切断して、断面を２次元に展開してできる翼断面で、その翼断面における中心線は略円弧形状とし、前記翼断面の翼弦長Ｌと反りＤで反り率Ｑは、Ｑ＝Ｄ／Ｌで与え、外周部の翼断面における外周部反り率Ｑｔが、前記外周部より内周側の任意の前記反り率Ｑより大きな値をとり、前記外周部反り率Ｑｔと前記翼の前記内周部の翼断面における内周部反り率Ｑｈとの差が０．００１以上０．０２０以下になり、かつ、前記翼断面における翼弦と、前記回転軸と垂直で前記翼の前縁部を通る直線である翼列線とのなす角を取付角Ｃθとし、前記外周部の翼断面における外周部取付角Ｃθｔが、前記外周部より内周側の任意の前記取付角Ｃθより大きな値をとり、前記外周部取付角Ｃθｔと前記翼の前記内周部の翼断面における内周部取付角Ｃθｈとの差が０．１゜以上６゜以下になる前記軸流羽根車を有する請求項１記載の送風機。   A blade section obtained by cutting a blade with a cylindrical surface of an arbitrary diameter DD centered on the rotational axis of an axial flow impeller and developing the section in two dimensions, and the center line in the blade section has a substantially arc shape, The warp rate Q with the chord length L and warp D of the blade cross section is given by Q = D / L, and the outer periphery warp rate Qt in the blade cross section of the outer peripheral portion is the arbitrary warpage on the inner peripheral side from the outer peripheral portion. A value larger than the rate Q, the difference between the outer peripheral warpage rate Qt and the inner peripheral warpage rate Qh in the blade cross section of the inner peripheral portion of the blade is 0.001 or more and 0.020 or less, and An angle formed by a chord in the blade cross section and a blade row line that is perpendicular to the rotation axis and passes through the leading edge of the blade is defined as a mounting angle Cθ, and an outer peripheral mounting angle Cθt in the blade cross section of the outer peripheral portion is , Takes a value larger than the arbitrary mounting angle Cθ on the inner peripheral side from the outer peripheral part, and the outer peripheral part mounting angle C Blower according to claim 1, wherein the difference between the inner peripheral portion mounting angle Cθh has said axial flow impeller falls below 6 ° 0.1 ° in blade section of the inner peripheral portion of the the t wing. 軸流羽根車の任意の直径ＤＤの翼断面における翼弦長Ｌと、回転軸と垂直で翼の前縁部を通る直線である翼列線上で、前記翼の前記前縁部と前記翼と隣り合う前記翼の前記前縁部との距離をピッチＴとしたとき弦節比Ｓは、Ｓ＝Ｌ／Ｔで与え、弦節比Ｓは１．１以上１．９以下になる前記軸流羽根車を有する請求項１、２、３、４、５、６または７記載の送風機。   On the blade chord length L in the blade cross section of an arbitrary diameter DD of the axial flow impeller, and on the cascade line that is perpendicular to the rotation axis and passes through the leading edge of the blade, the leading edge of the blade and the blade The chordal ratio S is given by S = L / T when the distance from the leading edge of the adjacent wings is a pitch T, and the axial flow in which the chordal ratio S is 1.1 or more and 1.9 or less. The blower according to claim 1, further comprising an impeller.
JP2002150335A 1995-06-01 2002-05-24 Blower Expired - Fee Related JP3641252B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002150335A JP3641252B2 (en) 1995-06-01 2002-05-24 Blower

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP13492295 1995-06-01
JP7-134922 1995-06-01
JP2002150335A JP3641252B2 (en) 1995-06-01 2002-05-24 Blower

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP12676196A Division JP3461661B2 (en) 1995-06-01 1996-05-22 Blower

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JP3641252B2 true JP3641252B2 (en) 2005-04-20

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US7381129B2 (en) * 2004-03-15 2008-06-03 Airius, Llc. Columnar air moving devices, systems and methods
US20120195749A1 (en) 2004-03-15 2012-08-02 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
JP4844190B2 (en) * 2006-03-27 2011-12-28 パナソニック株式会社 Propeller fan and pipe exhaust fan
JP4943817B2 (en) * 2006-10-31 2012-05-30 日本電産サーボ株式会社 Axial fan
US9151295B2 (en) 2008-05-30 2015-10-06 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
EP2721350B1 (en) 2011-06-15 2019-02-27 Airius IP Holdings, LLC Columnar air moving devices, systems and methods
EP2721352B1 (en) 2011-06-15 2015-09-16 Airius IP Holdings, LLC Columnar air moving devices and systems
USD698916S1 (en) 2012-05-15 2014-02-04 Airius Ip Holdings, Llc Air moving device
US10024531B2 (en) 2013-12-19 2018-07-17 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
CA2875347C (en) 2013-12-19 2022-04-19 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
AU2015269672B2 (en) 2014-06-06 2019-05-16 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
JP6518122B2 (en) * 2015-04-28 2019-05-22 エビスマリン株式会社 Fluid flow device
USD820967S1 (en) 2016-05-06 2018-06-19 Airius Ip Holdings Llc Air moving device
USD805176S1 (en) 2016-05-06 2017-12-12 Airius Ip Holdings, Llc Air moving device
US10487852B2 (en) 2016-06-24 2019-11-26 Airius Ip Holdings, Llc Air moving device
USD886275S1 (en) 2017-01-26 2020-06-02 Airius Ip Holdings, Llc Air moving device
USD885550S1 (en) 2017-07-31 2020-05-26 Airius Ip Holdings, Llc Air moving device
USD887541S1 (en) 2019-03-21 2020-06-16 Airius Ip Holdings, Llc Air moving device
GB2617743B (en) 2019-04-17 2024-04-03 Airius Ip Holdings Llc Air moving device with bypass intake

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